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</div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Ordnance Survey National Grid</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. 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interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/National_Grid_(Ordnance_Survey)" title="National Grid (Ordnance Survey) – German" lang="de" hreflang="de" data-title="National Grid (Ordnance Survey)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B4%D8%A8%DA%A9%D9%87_%D9%85%D9%84%DB%8C_%D9%85%D8%B1%D8%AC%D8%B9" title="شبکه ملی مرجع – Persian" lang="fa" hreflang="fa" data-title="شبکه ملی مرجع" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Ordnance_Survey_National_Grid" title="Ordnance Survey National Grid – French" lang="fr" hreflang="fr" data-title="Ordnance Survey National Grid" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%86%E0%A4%B0%E0%A5%8D%E0%A4%A1%E0%A4%BF%E0%A4%A8%E0%A5%87%E0%A4%82%E0%A4%B8_%E0%A4%B8%E0%A4%B0%E0%A5%8D%E0%A4%B5%E0%A5%87%E0%A4%95%E0%A5%8D%E0%A4%B7%E0%A4%A3_%E0%A4%B0%E0%A4%BE%E0%A4%B7%E0%A5%8D%E0%A4%9F%E0%A5%8D%E0%A4%B0%E0%A5%80%E0%A4%AF_%E0%A4%97%E0%A5%8D%E0%A4%B0%E0%A4%BF%E0%A4%A1" title="आर्डिनेंस सर्वेक्षण राष्ट्रीय ग्रिड – Hindi" lang="hi" hreflang="hi" data-title="आर्डिनेंस सर्वेक्षण राष्ट्रीय ग्रिड" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Sistem_grid_Britania" title="Sistem grid Britania – Indonesian" lang="id" hreflang="id" data-title="Sistem grid Britania" data-language-autonym="Bahasa Indonesia" 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National Grid – Simple English" lang="en-simple" hreflang="en-simple" data-title="Ordnance Survey National Grid" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/%C4%B0ngiliz_grid_referans_sistemi" title="İngiliz grid referans sistemi – Turkish" lang="tr" hreflang="tr" data-title="İngiliz grid referans sistemi" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E8%8B%B1%E5%9C%8B%E5%9C%8B%E5%AE%B6%E6%A0%BC%E7%B6%B2%E5%8F%83%E8%80%83%E7%B3%BB%E7%B5%B1" title="英國國家格網參考系統 – Chinese" lang="zh" hreflang="zh" data-title="英國國家格網參考系統" data-language-autonym="中文" data-language-local-name="Chinese" 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height="121" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Globe_Atlantic.svg/180px-Globe_Atlantic.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Globe_Atlantic.svg/240px-Globe_Atlantic.svg.png 2x" data-file-width="717" data-file-height="721" /></a></span></td></tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">Fundamentals</div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Geodesy" title="Geodesy">Geodesy</a></li> <li><a href="/wiki/Geodynamics" title="Geodynamics">Geodynamics</a></li> <li><a href="/wiki/Geomatics" title="Geomatics">Geomatics</a></li> <li><a href="/wiki/History_of_geodesy" title="History of geodesy">History</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">Concepts</div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Geographical_distance" title="Geographical distance">Geographical distance</a></li> <li><a href="/wiki/Geoid" title="Geoid">Geoid</a></li> <li><a href="/wiki/Figure_of_the_Earth" title="Figure of the Earth">Figure of the Earth</a> <small>(<a href="/wiki/Earth_radius" title="Earth radius">radius</a> and <a href="/wiki/Earth%27s_circumference" title="Earth's circumference">circumference</a>)</small></li> <li><a href="/wiki/Geodetic_coordinates" title="Geodetic coordinates">Geodetic coordinates</a></li> <li><a href="/wiki/Geodetic_datum" title="Geodetic datum">Geodetic datum</a></li> <li><a href="/wiki/Geodesic" title="Geodesic">Geodesic</a></li> <li><a href="/wiki/Horizontal_position_representation" title="Horizontal position representation">Horizontal position representation</a></li> <li><span class="nowrap"><a href="/wiki/Latitude" title="Latitude">Latitude</a> / <a href="/wiki/Longitude" title="Longitude">Longitude</a></span></li> <li><a href="/wiki/Map_projection" title="Map projection">Map projection</a></li> <li><a href="/wiki/Reference_ellipsoid" class="mw-redirect" title="Reference ellipsoid">Reference ellipsoid</a></li> <li><a href="/wiki/Satellite_geodesy" title="Satellite geodesy">Satellite geodesy</a></li> <li><a href="/wiki/Spatial_reference_system" title="Spatial reference system">Spatial reference system</a></li> <li><a href="/wiki/Spatial_relation" title="Spatial relation">Spatial relations</a></li> <li><a href="/wiki/Vertical_position" title="Vertical position">Vertical positions</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">Technologies</div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Satellite_navigation" title="Satellite navigation">Global Nav. Sat. Systems (GNSSs)</a></li> <li><a href="/wiki/Global_Positioning_System" title="Global Positioning System">Global Pos. System (GPS)</a></li> <li><a href="/wiki/GLONASS" title="GLONASS">GLONASS <span style="font-size: 85%;">(Russia)</span></a></li> <li><a href="/wiki/BeiDou" title="BeiDou">BeiDou (BDS) <span style="font-size: 85%;">(China)</span></a></li> <li><a href="/wiki/Galileo_(satellite_navigation)" title="Galileo (satellite navigation)">Galileo <span style="font-size: 85%;">(Europe)</span></a></li> <li><a href="/wiki/Indian_Regional_Navigation_Satellite_System" title="Indian Regional Navigation Satellite System">NAVIC <span style="font-size: 85%;">(India)</span></a></li> <li><a href="/wiki/Quasi-Zenith_Satellite_System" title="Quasi-Zenith Satellite System">Quasi-Zenith Sat. Sys. (QZSS) <span style="font-size: 85%;">(Japan)</span></a></li> <li><a href="/wiki/Discrete_Global_Grid" class="mw-redirect" title="Discrete Global Grid">Discrete Global Grid and Geocoding</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed plainlist"><div class="sidebar-list-title" style="color: var(--color-base)">Standards (history)</div><div class="sidebar-list-content mw-collapsible-content hlist"><table class="nowrap" style="width:100%;border-collapse:collapse;border-spacing:0px 0px;border:none;line-height:1.2em;"><tbody><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/Sea_Level_Datum_of_1929" class="mw-redirect" title="Sea Level Datum of 1929">NGVD 29</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Sea Level Datum 1929</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/OSGB36" class="mw-redirect" title="OSGB36">OSGB36</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Ordnance Survey Great Britain 1936</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/SK-42_reference_system" title="SK-42 reference system">SK-42</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Systema Koordinat 1942 goda</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/ED50" title="ED50">ED50</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> European Datum 1950</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/South_American_Datum#SAD69" title="South American Datum">SAD69</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> South American Datum 1969</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/GRS_80" class="mw-redirect" title="GRS 80">GRS 80</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Geodetic Reference System 1980</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/ISO_6709" title="ISO 6709">ISO 6709</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Geographic point coord. 1983</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/North_American_Datum#North_American_Datum_of_1983" title="North American Datum">NAD 83</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> North American Datum 1983</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/World_Geodetic_System" title="World Geodetic System">WGS 84</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> World Geodetic System 1984</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/North_American_Vertical_Datum_of_1988" title="North American Vertical Datum of 1988">NAVD 88</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> N. American Vertical Datum 1988</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/European_Terrestrial_Reference_System_1989" title="European Terrestrial Reference System 1989">ETRS89</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> European Terrestrial Ref. Sys. 1989</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/Restrictions_on_geographic_data_in_China" title="Restrictions on geographic data in China">GCJ-02</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Chinese obfuscated datum 2002</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/Geo_URI_scheme" title="Geo URI scheme">Geo URI</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Internet link to a point 2010</td></tr></tbody></table> <ul><li><a href="/wiki/International_Terrestrial_Reference_System" class="mw-redirect" title="International Terrestrial Reference System">International Terrestrial Reference System</a></li> <li><a href="/wiki/SRID" class="mw-redirect" title="SRID">Spatial Reference System Identifier (SRID)</a></li> <li><a href="/wiki/Universal_Transverse_Mercator_coordinate_system" title="Universal Transverse Mercator coordinate system">Universal Transverse Mercator (UTM)</a></li></ul></div></div></td> </tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Geodesy" title="Template:Geodesy"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Geodesy" title="Template talk:Geodesy"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Geodesy" title="Special:EditPage/Template:Geodesy"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> <p>The <b>Ordnance Survey National Grid reference system</b> (<b>OSGB</b>), also known as <b>British National Grid</b> (<b>BNG</b>),<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> is a system of geographic <a href="/wiki/Grid_reference" class="mw-redirect" title="Grid reference">grid references</a>, distinct from <a href="/wiki/Latitude" title="Latitude">latitude</a> and <a href="/wiki/Longitude" title="Longitude">longitude</a>, whereby any location in Great Britain can be described in terms of its distance from the origin (0, 0), which lies to the west of the <a href="/wiki/Isles_of_Scilly" title="Isles of Scilly">Isles of Scilly</a>.<sup id="cite_ref-ONS_Geography_Guide_3-0" class="reference"><a href="#cite_note-ONS_Geography_Guide-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>The <a href="/wiki/Ordnance_Survey" title="Ordnance Survey">Ordnance Survey</a> (OS) devised the national grid reference system, and it is heavily used in its survey data, and in maps based on those surveys, whether published by the Ordnance Survey or by commercial map producers. Grid references are also commonly quoted in other publications and data sources, such as guide books and government planning documents. </p><p>A number of different systems exist that can provide grid references for locations within the <a href="/wiki/British_Isles" title="British Isles">British Isles</a>: this article describes the system created solely for Great Britain and its outlying islands (including the <a href="/wiki/Isle_of_Man" title="Isle of Man">Isle of Man</a>). The <a href="/wiki/Irish_grid_reference_system" title="Irish grid reference system">Irish grid reference system</a> is a similar system created by the <a href="/wiki/Ordnance_Survey_of_Ireland" class="mw-redirect" title="Ordnance Survey of Ireland">Ordnance Survey of Ireland</a> and the <a href="/wiki/Ordnance_Survey_of_Northern_Ireland" title="Ordnance Survey of Northern Ireland">Ordnance Survey of Northern Ireland</a> for the island of Ireland. The <a href="/wiki/Irish_Transverse_Mercator" title="Irish Transverse Mercator">Irish Transverse Mercator</a> (ITM) coordinate reference system was adopted in 2001 and is now the preferred coordinate reference system across Ireland. ITM is based on the <a href="/wiki/Universal_Transverse_Mercator_coordinate_system" title="Universal Transverse Mercator coordinate system">Universal Transverse Mercator coordinate system</a> (UTM), used to provide grid references for worldwide locations, and this is the system commonly used for the <a href="/wiki/Channel_Islands" title="Channel Islands">Channel Islands</a>. European-wide agencies also use UTM when mapping locations, or may use the <a href="/wiki/Military_Grid_Reference_System" title="Military Grid Reference System">Military Grid Reference System</a> (MGRS), or variants of it. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Grid_letters">Grid letters</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=1" title="Edit section: Grid letters"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:British_National_Grid.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/British_National_Grid.svg/220px-British_National_Grid.svg.png" decoding="async" width="220" height="407" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/British_National_Grid.svg/330px-British_National_Grid.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/18/British_National_Grid.svg/440px-British_National_Grid.svg.png 2x" data-file-width="204" data-file-height="377" /></a><figcaption>100km squares</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Ordnance_Survey_1-250000_-_TF.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Ordnance_Survey_1-250000_-_TF.jpg/220px-Ordnance_Survey_1-250000_-_TF.jpg" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Ordnance_Survey_1-250000_-_TF.jpg/330px-Ordnance_Survey_1-250000_-_TF.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Ordnance_Survey_1-250000_-_TF.jpg/440px-Ordnance_Survey_1-250000_-_TF.jpg 2x" data-file-width="4000" data-file-height="4000" /></a><figcaption>Grid square TF. The map shows <a href="/wiki/The_Wash" title="The Wash">The Wash</a> and the <a href="/wiki/North_Sea" title="North Sea">North Sea</a>, as well as places within the counties of <a href="/wiki/Lincolnshire" title="Lincolnshire">Lincolnshire</a>, Cambridgeshire and <a href="/wiki/Norfolk" title="Norfolk">Norfolk</a>.</figcaption></figure> <p>The first letter of the British National Grid is derived from a larger set of 25 squares of size 500 km by 500 km, labelled A to Z, omitting one letter (I) (refer diagram below), previously used as a military grid.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Four of these largest squares contain significant land area within Great Britain: S, T, N and H. The O square contains a tiny area of <a href="/wiki/North_Yorkshire" title="North Yorkshire">North Yorkshire</a>, <a href="/wiki/Beast_Cliff" title="Beast Cliff">Beast Cliff</a> at <span class="plainlinks nourlexpansion" style="white-space: nowrap"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Ordnance_Survey_National_Grid&params=54.385675_N_0.461660_W_region:GB_scale:25000">OV 0000</a></span>, almost all of which lies below mean high tide.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> For the second letter, each 500 km square is subdivided into 25 squares of size 100 km by 100 km, each with a letter code from A to Z (again omitting I) starting with A in the north-west corner to Z in the south-east corner. These squares are outlined in light grey on the "100km squares" map, with those containing land lettered. The central (2° W) meridian is shown in red. </p> <div class="mw-heading mw-heading2"><h2 id="Grid_digits">Grid digits</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=2" title="Edit section: Grid digits"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Within each square, <i>eastings</i> and <i>northings</i> from the south west corner of the square are given numerically. For example, NH0325 means a 1 km square whose south-west corner is 3 km east and 25 km north from the south-west corner of square NH. A location can be indicated to varying resolutions numerically, usually from two digits in each coordinate (for a 1 km square) through to five (for a 1 m square); in each case the first half of the digits is for the first coordinate and the second half for the other. The most common usage is the <i>six figure grid reference</i>, employing three digits in each coordinate to determine a 100 m square. For example, the grid reference of the 100 m square containing the summit of <a href="/wiki/Ben_Nevis" title="Ben Nevis">Ben Nevis</a> is <b><span class="plainlinks nourlexpansion" style="white-space: nowrap"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Ordnance_Survey_National_Grid&params=56.796029_N_5.004711_W_region:GB_scale:25000&title=NN+166+712">NN 166 712</a></span></b>. (Grid references may be written with or without spaces; e.g., also NN166712.) NN has an easting of 200 km and northing of 700 km, so the OSGB36 National Grid location for Ben Nevis is at 216600, 771200. </p> <figure class="mw-halign-none" typeof="mw:File/Thumb"><a href="/wiki/File:Ordnance_Survey_National_Grid.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Ordnance_Survey_National_Grid.svg/500px-Ordnance_Survey_National_Grid.svg.png" decoding="async" width="500" height="500" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Ordnance_Survey_National_Grid.svg/750px-Ordnance_Survey_National_Grid.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Ordnance_Survey_National_Grid.svg/1000px-Ordnance_Survey_National_Grid.svg.png 2x" data-file-width="512" data-file-height="512" /></a><figcaption>Illustration of the Ordnance Survey National Grid coordinate system, with <a href="/wiki/Royal_Observatory_Greenwich" class="mw-redirect" title="Royal Observatory Greenwich">Royal Observatory Greenwich</a> as an example</figcaption></figure> <div class="mw-heading mw-heading2"><h2 id="All-numeric_grid_references">All-numeric grid references</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=3" title="Edit section: All-numeric grid references"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Grid references may also be quoted as a pair of numbers: eastings then northings in metres, measured from the southwest corner of the SV square. 13 digits may be required for locations in <a href="/wiki/Orkney" title="Orkney">Orkney</a> and further north. For example, the grid reference for <a href="/wiki/Sullom_Voe_Oil_Terminal" class="mw-redirect" title="Sullom Voe Oil Terminal">Sullom Voe Oil Terminal</a> in the <a href="/wiki/Shetland" title="Shetland">Shetland</a> islands may be given as <span class="plainlinks nourlexpansion" style="white-space: nowrap"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Ordnance_Survey_National_Grid&params=60.459520_N_1.281867_W_region:GB_scale:25000&title=HU396753">HU396753</a></span> or 439668,1175316. </p><p>Another, distinct, form of all-numeric grid reference is an abbreviated alphanumeric reference where the letters are simply omitted, e.g. 166712 for the summit of Ben Nevis. Unlike the numeric references described above, this abbreviated grid reference is incomplete; it gives the location relative to an OS 100×100 km square, but does not specify which square. It is often used informally when the context identifies the OS 2-letter square. For example, within the context of a location known to be on <a href="/wiki/Ordnance_Survey#Map_range" title="Ordnance Survey">OS Landranger sheet</a> 41 (which extends from NN000500 in the south-west to NN400900 in the north-east) the abbreviated grid reference 166712 is equivalent to NN166712. If working with more than one Landranger sheet, this may also be given as 41/166712. </p><p>Alternatively, sometimes numbers instead of the two-letter combinations are used for the 100×100 km squares. The numbering follows a grid index where the tens denote the progress from West to East and the units from South to North. In the north of Scotland, the numbering is modified: the 100 km square to the north of 39 is numbered N30; the square to the north of 49 is N40, etc. </p> <div class="mw-heading mw-heading2"><h2 id="Compatibility_with_related_systems">Compatibility with related systems</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=4" title="Edit section: Compatibility with related systems"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The grid is based on the <b>OSGB36 datum</b> (Ordnance Survey Great Britain 1936). The <a href="/wiki/Map_datum" class="mw-redirect" title="Map datum">datum</a> was introduced after the <a href="/wiki/Retriangulation_of_Great_Britain" title="Retriangulation of Great Britain">retriangulation of 1936–1962</a>.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (February 2017)">citation needed</span></a></i>]</sup> It replaced the <a href="/wiki/Cassini_Grid" title="Cassini Grid">Cassini Grid</a> which had previously been the standard projection for Ordnance Survey maps.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> A <a href="/wiki/Datum_transformation" class="mw-redirect" title="Datum transformation">datum transformation</a> exists between GRS36 and more recent geocentric frames (see below). </p><p>OSGB36 is based on the <b>Airy ellipsoid</b>, a <a href="/wiki/Reference_ellipsoid" class="mw-redirect" title="Reference ellipsoid">reference ellipsoid</a> named after <a href="/wiki/George_Biddell_Airy" title="George Biddell Airy">George Biddell Airy</a>. Introduced in 1830, it is a best fit for the Britain region. More modern mapping tends to use the <a href="/wiki/GRS80" class="mw-redirect" title="GRS80">GRS80</a> or <a href="/wiki/WGS84" class="mw-redirect" title="WGS84">WGS84</a> ellipsoid, as used by the <a href="/wiki/Global_Positioning_System" title="Global Positioning System">Global Positioning System</a>. The Airy ellipsoid assumes the Earth to be about 1 km smaller in diameter than the global/world ellipsoid, and to be slightly less flattened. </p><p>The British maps adopt a <a href="/wiki/Transverse_Mercator_projection" title="Transverse Mercator projection">transverse Mercator projection</a> with an origin (the "true" origin) at <a href="/wiki/49th_parallel_north" title="49th parallel north">49° N</a>, <a href="/wiki/2nd_meridian_west" title="2nd meridian west">2° W</a> (an offshore point in the <a href="/wiki/English_Channel" title="English Channel">English Channel</a> which lies between the island of <a href="/wiki/Jersey" title="Jersey">Jersey</a> and the French port of <a href="/wiki/Saint-Malo" title="Saint-Malo">St. Malo</a>).<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Over the Airy ellipsoid a straight line grid, the National Grid, is placed with a new <a href="/wiki/False_origin" class="mw-redirect" title="False origin">false origin</a> to eliminate negative numbers, creating a 700 km by 1300 km grid. This false origin is located south-west of the Isles of Scilly. </p><p>In order to minimize the overall scale error, a factor of 2499/2500 is applied. This creates two secant lines of longitude about 180 km east and west of the central meridian along which the local scale factor equals 1, i.e. map scale is correct. Inside these lines the local scale factor is less than 1, with a minimum of 0.04% too small at the central meridian.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Outside these lines the local scale factor is greater than 1, and is about 0.04% too large near the east and west coasts. Grid north and true north are only aligned on the central meridian (400 km easting) of the grid which is 2° W (OSGB36) and approx. <span class="nowrap">2° 0′ 5″ W</span> (<a href="/wiki/World_Geodetic_System" title="World Geodetic System">WGS 84</a>). </p><p>A <a href="/wiki/Geodesy" title="Geodesy">geodetic</a> transformation between OSGB36 and other terrestrial reference systems (like <a href="/wiki/International_Terrestrial_Reference_System" class="mw-redirect" title="International Terrestrial Reference System">ITRF2000</a>, <a href="/wiki/ETRS89" class="mw-redirect" title="ETRS89">ETRS89</a>, or <a href="/wiki/World_Geodetic_System" title="World Geodetic System">WGS84</a>) can become quite tedious if attempted manually. The most common transformation is called the <a href="/wiki/Helmert_transformation" title="Helmert transformation">Helmert datum transformation</a>, which results in a typical 7 m error. The definitive transformation from ETRS89 that is published by the Ordnance Survey is called the National Grid Transformation OSTN15.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> This models the detailed distortions in the 1936–1962 retriangulation, and achieves backwards compatibility in grid coordinates to sub-metre accuracy. </p> <div class="mw-heading mw-heading3"><h3 id="Datum_shift_between_OSGB_36_and_WGS_84">Datum shift between OSGB 36 and WGS 84</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=5" title="Edit section: Datum shift between OSGB 36 and WGS 84"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The difference between the coordinates on different datums varies from place to place. The <a href="/wiki/Longitude" title="Longitude">longitude</a> and <a href="/wiki/Latitude" title="Latitude">latitude</a> positions on OSGB 36 are the same as for <a href="/wiki/World_Geodetic_System" title="World Geodetic System">WGS 84</a> at a point in the Atlantic Ocean well to the west of Great Britain. In <a href="/wiki/Cornwall" title="Cornwall">Cornwall</a>, the WGS 84 longitude meridians are about 70 metres east of their OSGB 36 equivalents, this value rising gradually to about 120 m east on the east coast of <a href="/wiki/East_Anglia" title="East Anglia">East Anglia</a>. The WGS 84 latitude parallels are about 70 m south of the OSGB 36 lines in South Cornwall, the difference diminishing to zero in the <a href="/wiki/Scottish_Borders" title="Scottish Borders">Scottish Borders</a>, and then increasing to about 50 m north on the north coast of <a href="/wiki/Scotland" title="Scotland">Scotland</a>. The smallest datum shift is on the west coast of Scotland and the greatest in <a href="/wiki/Kent" title="Kent">Kent</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Datum_shift_between_OSGB_36_and_ED50">Datum shift between OSGB 36 and ED50</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=6" title="Edit section: Datum shift between OSGB 36 and ED50"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>These two datums are not both in general use in any one place, but for a point in the <a href="/wiki/English_Channel" title="English Channel">English Channel</a> halfway between <a href="/wiki/Dover" title="Dover">Dover</a> and <a href="/wiki/Calais" title="Calais">Calais</a>, the <a href="/wiki/ED50" title="ED50">ED50</a> longitude lines are about 20 m east of the OSGB36 equivalents, and the ED50 latitude lines are about 150 m south of the OSGB36 ones.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (December 2014)">citation needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading2"><h2 id="Summary_parameters_of_the_coordinate_system">Summary parameters of the coordinate system</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=7" title="Edit section: Summary parameters of the coordinate system"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Datum_(geodesy)" class="mw-redirect" title="Datum (geodesy)">Datum</a>: OSGB36</li> <li><a href="/wiki/Map_projection" title="Map projection">Map projection</a>: <a href="/wiki/Transverse_Mercator_projection" title="Transverse Mercator projection">Transverse Mercator projection</a> using <a href="/wiki/Transverse_Mercator:_Redfearn_series" title="Transverse Mercator: Redfearn series">Redfearn series</a></li> <li>True origin: <a href="/wiki/49th_parallel_north" title="49th parallel north">49°N</a>, <a href="/wiki/2nd_meridian_west" title="2nd meridian west">2°W</a></li> <li><a href="/wiki/False_origin" class="mw-redirect" title="False origin">False origin</a>: 400 km west, 100 km north of True Origin</li> <li>Scale factor: 0.9996012717<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>a<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/EPSG" class="mw-redirect" title="EPSG">EPSG</a> Code: EPSG:27700</li> <li><a href="/wiki/Reference_ellipsoid" class="mw-redirect" title="Reference ellipsoid">Ellipsoid</a>: Airy 1830<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>b<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Semi-major_axis" class="mw-redirect" title="Semi-major axis">Semi-major axis</a> a: <span style="white-space:nowrap">6<span style="margin-left:0.25em">377</span><span style="margin-left:0.25em">563.396</span> m</span></li> <li><a href="/wiki/Semi-minor_axis" class="mw-redirect" title="Semi-minor axis">Semi-minor axis</a> b: <span style="white-space:nowrap">6<span style="margin-left:0.25em">356</span><span style="margin-left:0.25em">256.909</span> m</span></li> <li><a href="/wiki/Flattening" title="Flattening">Flattening</a> (derived constant): 1/299.3249646</li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=8" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Ordnance_Datum_Newlyn" class="mw-redirect" title="Ordnance Datum Newlyn">Ordnance Datum Newlyn</a></li> <li><a href="/wiki/International_Map_of_the_World#Map_Indexing_System" title="International Map of the World">International Map of the World § Map Indexing System</a></li> <li><a href="/wiki/Irish_grid_reference_system" title="Irish grid reference system">Irish grid reference system</a></li> <li><a href="/wiki/Maidenhead_Locator_System" title="Maidenhead Locator System">Maidenhead Locator System</a></li> <li><a href="/wiki/United_States_National_Grid" title="United States National Grid">United States National Grid</a></li> <li><a href="/wiki/World_Geodetic_System" title="World Geodetic System">World Geodetic System</a></li></ul> <dl><dt>Custom units of measure</dt> <dd> <ul><li><a href="/wiki/Tetrad_(unit_of_area)" class="mw-redirect" title="Tetrad (unit of area)">Tetrad</a></li> <li><a href="/wiki/Hectad_(unit_of_area)" class="mw-redirect" title="Hectad (unit of area)">Hectad</a></li> <li><a href="/wiki/Myriad_(unit_of_area)" class="mw-redirect" title="Myriad (unit of area)">Myriad</a></li></ul></dd></dl> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=9" title="Edit section: Notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-lower-alpha"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text">Scale factor is defined by its base-10 logarithm of (0.9998268 − 1) exactly.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text">The defining Airy dimensions are a 20923713 feet, b 20853810 feet. In the Retriangulation the base-10 logarithm of the number of metres in a foot was set at (0.48401603 − 1)<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> exactly and the Airy metric dimensions are calculated from that. The flattening is exactly 69903 divided by 20923713.</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=10" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626" /><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://spatialreference.org/ref/epsg/27700/">"OSGB 1936 / British National Grid: EPSG Projection — Spatial Reference"</a>. <i>spatialreference.org</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160310012956/http://spatialreference.org/ref/epsg/27700/">Archived</a> from the original on 10 March 2016<span class="reference-accessdate">. Retrieved <span class="nowrap">9 March</span> 2016</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=spatialreference.org&rft.atitle=OSGB+1936+%2F+British+National+Grid%3A+EPSG+Projection+%E2%80%94+Spatial+Reference&rft_id=http%3A%2F%2Fspatialreference.org%2Fref%2Fepsg%2F27700%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://resource.esriuk.com/blog/2012-3-26-coordinate-systems-and-projections-for-beginners-html/">"Coordinate systems and projections for beginners"</a>. 26 March 2012. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20211026090950/https://resource.esriuk.com/blog/2012-3-26-coordinate-systems-and-projections-for-beginners-html/">Archived</a> from the original on 26 October 2021<span class="reference-accessdate">. Retrieved <span class="nowrap">19 September</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Coordinate+systems+and+projections+for+beginners&rft.date=2012-03-26&rft_id=https%3A%2F%2Fresource.esriuk.com%2Fblog%2F2012-3-26-coordinate-systems-and-projections-for-beginners-html%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-ONS_Geography_Guide-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-ONS_Geography_Guide_3-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://geoportal.statistics.gov.uk/datasets/a-beginners-guide-to-uk-geography-2023/about">"A Beginners Guide to UK Geography (2023)"</a>. <i>Open Geography Portal</i>. Office for National Statistics. 24 August 2023<span class="reference-accessdate">. Retrieved <span class="nowrap">9 December</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Open+Geography+Portal&rft.atitle=A+Beginners+Guide+to+UK+Geography+%282023%29&rft.date=2023-08-24&rft_id=https%3A%2F%2Fgeoportal.statistics.gov.uk%2Fdatasets%2Fa-beginners-guide-to-uk-geography-2023%2Fabout&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20060517190658/http://www.ordnancesurvey.co.uk/oswebsite/gps/information/coordinatesystemsinfo/guidetonationalgrid/page9.html">"The grid square convention 1 (Guide to the National Grid, page 9)"</a>. <i>Ordnance Survey</i>. Archived from <a rel="nofollow" class="external text" href="http://www.ordnancesurvey.co.uk/oswebsite/gps/information/coordinatesystemsinfo/guidetonationalgrid/page9.html">the original</a> on 17 May 2006.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Ordnance+Survey&rft.atitle=The+grid+square+convention+1+%28Guide+to+the+National+Grid%2C+page+9%29&rft_id=http%3A%2F%2Fwww.ordnancesurvey.co.uk%2Foswebsite%2Fgps%2Finformation%2Fcoordinatesystemsinfo%2Fguidetonationalgrid%2Fpage9.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFStanding2006" class="citation web cs1">Standing, Peter (2006). <a rel="nofollow" class="external text" href="https://www.geograph.org.uk/article/In-Search-of-OV0000">"OV0000 a unique grid square at Beast Cliff"</a>. Geograph Project. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20171101115044/http://www.geograph.org.uk/article/In-Search-of-OV0000">Archived</a> from the original on 1 November 2017<span class="reference-accessdate">. Retrieved <span class="nowrap">11 June</span> 2007</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=OV0000+a+unique+grid+square+at+Beast+Cliff&rft.pub=Geograph+Project&rft.date=2006&rft.aulast=Standing&rft.aufirst=Peter&rft_id=https%3A%2F%2Fwww.geograph.org.uk%2Farticle%2FIn-Search-of-OV0000&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFWinterbotham1925" class="citation journal cs1">Winterbotham, Harold St. John Loyd (1925). <a rel="nofollow" class="external text" href="https://archive.org/details/h.-s.-l.-w.-1925-sim-geographical-journal-1925-02-65-2">"Ordnance Survey of Scotland "Popular" Edition. One-inch map"</a>. <i>The Geographical Journal</i>. <b>65</b> (2): <span class="nowrap">160–</span>162. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.2307%2F1782246">10.2307/1782246</a>. <a href="/wiki/JSTOR_(identifier)" class="mw-redirect" title="JSTOR (identifier)">JSTOR</a> <a rel="nofollow" class="external text" href="https://www.jstor.org/stable/1782246">1782246</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Geographical+Journal&rft.atitle=Ordnance+Survey+of+Scotland+%22Popular%22+Edition.+One-inch+map&rft.volume=65&rft.issue=2&rft.pages=%3Cspan+class%3D%22nowrap%22%3E160-%3C%2Fspan%3E162&rft.date=1925&rft_id=info%3Adoi%2F10.2307%2F1782246&rft_id=https%3A%2F%2Fwww.jstor.org%2Fstable%2F1782246%23id-name%3DJSTOR&rft.aulast=Winterbotham&rft.aufirst=Harold+St.+John+Loyd&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fh.-s.-l.-w.-1925-sim-geographical-journal-1925-02-65-2&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFSteers1965" class="citation book cs1">Steers, James Alfred (1965). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/studyofmapprojec0000unse"><i>An Introduction to the Study of Map Projections</i></a></span> (15 ed.). University of London Press. p. 229.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=An+Introduction+to+the+Study+of+Map+Projections&rft.pages=229&rft.edition=15&rft.pub=University+of+London+Press&rft.date=1965&rft.aulast=Steers&rft.aufirst=James+Alfred&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fstudyofmapprojec0000unse&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><a href="#OSNet">OS Net, The true origin</a></span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFOrdnance_Survey1946" class="citation web cs1">Ordnance Survey (1946). <a rel="nofollow" class="external text" href="https://archive.org/details/NationalGridDescriptionOrdnanceSurvey1946HMSOImages">"A brief description of the National Grid and reference system"</a>. London: His Majesty's Stationery Office. p. 4.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=A+brief+description+of+the+National+Grid+and+reference+system&rft.pages=4&rft.pub=London%3A+His+Majesty%27s+Stationery+Office&rft.date=1946&rft.au=Ordnance+Survey&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2FNationalGridDescriptionOrdnanceSurvey1946HMSOImages&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFGreaves2016" class="citation journal cs1">Greaves, Mark (2016). <a rel="nofollow" class="external text" href="https://www.ordnancesurvey.co.uk/documents/resources/updated-transformations-uk-ireland-geoid-model.pdf">"OSGM15 and OSTN15: Updated transformations for UK and Ireland"</a> <span class="cs1-format">(PDF)</span>. <i>Geomatics World</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220814184524/https://www.ordnancesurvey.co.uk/documents/resources/updated-transformations-uk-ireland-geoid-model.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 14 August 2022<span class="reference-accessdate">. Retrieved <span class="nowrap">5 October</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Geomatics+World&rft.atitle=OSGM15+and+OSTN15%3A+Updated+transformations+for+UK+and+Ireland&rft.date=2016&rft.aulast=Greaves&rft.aufirst=Mark&rft_id=https%3A%2F%2Fwww.ordnancesurvey.co.uk%2Fdocuments%2Fresources%2Fupdated-transformations-uk-ireland-geoid-model.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20170718035826/https://www.ordnancesurvey.co.uk/business-and-government/help-and-support/navigation-technology/os-net/gnss-positioning-services.html">"Surveying guidelines"</a>. Ordnance Survey. Archived from <a rel="nofollow" class="external text" href="https://www.ordnancesurvey.co.uk/business-and-government/help-and-support/navigation-technology/os-net/gnss-positioning-services.html">the original</a> on 18 July 2017.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Surveying+guidelines&rft.pub=Ordnance+Survey&rft_id=https%3A%2F%2Fwww.ordnancesurvey.co.uk%2Fbusiness-and-government%2Fhelp-and-support%2Fnavigation-technology%2Fos-net%2Fgnss-positioning-services.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFMugnier2003" class="citation web cs1">Mugnier, Clifford (October 2003). <a rel="nofollow" class="external text" href="https://www.asprs.org/wp-content/uploads/2012/05/10-2003-unitedkingdom.pdf">"Grids and Datums, United Kingdom"</a> <span class="cs1-format">(PDF)</span>. p. 1095. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20221004173158/https://www.asprs.org/wp-content/uploads/2012/05/10-2003-unitedkingdom.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 4 October 2022<span class="reference-accessdate">. Retrieved <span class="nowrap">19 February</span> 2022</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Grids+and+Datums%2C+United+Kingdom&rft.pages=1095&rft.date=2003-10&rft.aulast=Mugnier&rft.aufirst=Clifford&rft_id=https%3A%2F%2Fwww.asprs.org%2Fwp-content%2Fuploads%2F2012%2F05%2F10-2003-unitedkingdom.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text">A guide to coordinate systems in Great Britain (see External links), footnote 10 on page 44</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordnance_Survey_National_Grid&action=edit&section=11" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Ordnance Survey <a rel="nofollow" class="external text" href="https://www.ordnancesurvey.co.uk/documents/resources/guide-coordinate-systems-great-britain.pdf">A guide to coordinate systems in Great Britain</a>: An introduction to mapping coordinate systems and the use of GPS datasets with Ordnance Survey mapping; Version 3.6, 2020 [Retrieved 19 February 2022].</li> <li>Ordnance Survey's <a rel="nofollow" class="external text" href="https://web.archive.org/web/20190825073804/https://www.ordnancesurvey.co.uk/docs/support/national-grid.pdf">Grid script</a>: a brief introduction to the National Grid Reference; Version November 2011 [Retrieved 13 February 2014].</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="NGR" class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.ordnancesurvey.co.uk/support/the-national-grid.html">"The National Grid FAQs"</a>. Ordnance Survey<span class="reference-accessdate">. Retrieved <span class="nowrap">13 February</span> 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+National+Grid+FAQs&rft.pub=Ordnance+Survey&rft_id=http%3A%2F%2Fwww.ordnancesurvey.co.uk%2Fsupport%2Fthe-national-grid.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20190825073804/https://www.ordnancesurvey.co.uk/docs/support/national-grid.pdf">"Ordnance Survey Guide to the National Grid"</a> <span class="cs1-format">(PDF)</span>. Archived from <a rel="nofollow" class="external text" href="https://www.ordnancesurvey.co.uk/docs/support/national-grid.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 25 August 2019<span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Ordnance+Survey+Guide+to+the+National+Grid&rft_id=https%3A%2F%2Fwww.ordnancesurvey.co.uk%2Fdocs%2Fsupport%2Fnational-grid.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20190411194107/https://www.ordnancesurvey.co.uk/docs/support/guide-coordinate-systems-great-britain.pdf">"Ordnance Survey Guide to coordinate systems"</a> <span class="cs1-format">(PDF)</span>. Archived from <a rel="nofollow" class="external text" href="https://www.ordnancesurvey.co.uk/docs/support/guide-coordinate-systems-great-britain.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 11 April 2019<span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Ordnance+Survey+Guide+to+coordinate+systems&rft_id=https%3A%2F%2Fwww.ordnancesurvey.co.uk%2Fdocs%2Fsupport%2Fguide-coordinate-systems-great-britain.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://britishnationalgrid.uk/">"Interactive Ordnance Survey Mapping showing grid references"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Interactive+Ordnance+Survey+Mapping+showing+grid+references&rft_id=http%3A%2F%2Fbritishnationalgrid.uk%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.fieldenmaps.info/cconv/cconv_gb.html">"Co-ordinate Converter"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Co-ordinate+Converter&rft_id=http%3A%2F%2Fwww.fieldenmaps.info%2Fcconv%2Fcconv_gb.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span> - Multiple-format co-ordinate transformer for Great Britain & Channel Islands</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://mdfs.net/Apps/Mapping/GridRef/">"Programs to convert Ordnance Survey grid references"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Programs+to+convert+Ordnance+Survey+grid+references&rft_id=http%3A%2F%2Fmdfs.net%2FApps%2FMapping%2FGridRef%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.nearby.org.uk/tests/GeoTools.html">"Open Source Javascript Conversion Library"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Open+Source+Javascript+Conversion+Library&rft_id=http%3A%2F%2Fwww.nearby.org.uk%2Ftests%2FGeoTools.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080118121420/http://www.jstott.me.uk/jcoord/">"GPL Java Conversion Library"</a>. Archived from <a rel="nofollow" class="external text" href="http://www.jstott.me.uk/jcoord/">the original</a> on 18 January 2008<span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=GPL+Java+Conversion+Library&rft_id=http%3A%2F%2Fwww.jstott.me.uk%2Fjcoord%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://search.cpan.org/~toby/Geo-Coordinates-OSGB/">"Perl Conversion Library"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Perl+Conversion+Library&rft_id=http%3A%2F%2Fsearch.cpan.org%2F~toby%2FGeo-Coordinates-OSGB%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20070930204808/http://www.streetmap.co.uk/streetmap.dll?G2M%3FX=500060&Y=500020&A=Y&Z=3">"The sole part of Great Britain that lies in the OV square"</a>. Archived from <a rel="nofollow" class="external text" href="http://www.streetmap.co.uk/streetmap.dll?G2M%3FX=500060&Y=500020&A=Y&Z=3">the original</a> on 30 September 2007<span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+sole+part+of+Great+Britain+that+lies+in+the+OV+square&rft_id=http%3A%2F%2Fwww.streetmap.co.uk%2Fstreetmap.dll%3FG2M%253FX%3D500060%26Y%3D500020%26A%3DY%26Z%3D3&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.movable-type.co.uk/scripts/latlong-os-gridref.html">"Convert between Latitude/Longitude & OS National Grid References"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Convert+between+Latitude%2FLongitude+%26+OS+National+Grid+References&rft_id=https%3A%2F%2Fwww.movable-type.co.uk%2Fscripts%2Flatlong-os-gridref.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span> (JavaScript source code)</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://code.google.com/p/geocoordconversion/">".Net library to convert between lat/lon in various coordinate systems and grid reference"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=.Net+library+to+convert+between+lat%2Flon+in+various+coordinate+systems+and+grid+reference&rft_id=https%3A%2F%2Fcode.google.com%2Fp%2Fgeocoordconversion%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://gridreferencefinder.com/">"UK Grid Reference"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=UK+Grid+Reference&rft_id=http%3A%2F%2Fgridreferencefinder.com%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span> Web utility to find a UK grid reference</li> <li><a rel="nofollow" class="external text" href="http://osgr.mister.red">LatLong <> OS Grid Ref</a> converts & presents in many formats, generates specific links to that location for several useful map web pages - 1840–present. LatLong WSG84 <> GB, Ireland (inc NI) and Chanel Islands (30U) GR formats recognised. Distance measure for dog-leg routes & area calculations.</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/OrdnanceSurvey/OS-British-National-Grids">"OS British National Grids"</a>. <i><a href="/wiki/GitHub" title="GitHub">GitHub</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">15 August</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=GitHub&rft.atitle=OS+British+National+Grids&rft_id=https%3A%2F%2Fgithub.com%2FOrdnanceSurvey%2FOS-British-National-Grids&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOrdnance+Survey+National+Grid" class="Z3988"></span> Open source dataset (in GeoPackage format) of the British National Grids at various resolutions, available for download from Ordnance Survey's GitHub.</li></ul> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output .navbox-title,.mw-parser-output .navbox-abovebelow{padding:0.25em 1em;line-height:1.5em;text-align:center}.mw-parser-output .navbox-group{white-space:nowrap;text-align:right}.mw-parser-output .navbox,.mw-parser-output .navbox-subgroup{background-color:#fdfdfd}.mw-parser-output .navbox-list{line-height:1.5em;border-color:#fdfdfd}.mw-parser-output .navbox-list-with-group{text-align:left;border-left-width:2px;border-left-style:solid}.mw-parser-output tr+tr>.navbox-abovebelow,.mw-parser-output tr+tr>.navbox-group,.mw-parser-output tr+tr>.navbox-image,.mw-parser-output tr+tr>.navbox-list{border-top:2px solid #fdfdfd}.mw-parser-output .navbox-title{background-color:#ccf}.mw-parser-output .navbox-abovebelow,.mw-parser-output .navbox-group,.mw-parser-output .navbox-subgroup .navbox-title{background-color:#ddf}.mw-parser-output .navbox-subgroup .navbox-group,.mw-parser-output .navbox-subgroup .navbox-abovebelow{background-color:#e6e6ff}.mw-parser-output .navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Geocode_systems155" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse 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style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ICES_Statistical_Rectangles" title="ICES Statistical Rectangles">ICES Statistical Rectangles</a> (north-east Atlantic region)</li> <li><a href="/wiki/Irish_grid_reference_system" title="Irish grid reference system">Irish grid reference system</a></li> <li><a href="/wiki/National_Topographic_System" title="National Topographic System">National Topographic System</a> (Canada)</li> <li><a class="mw-selflink selflink">Ordnance Survey National Grid</a> (UK)</li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Postal_code" title="Postal code">Postal codes</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Postcodes_in_Australia" title="Postcodes in Australia">Australian post codes</a></li> <li><a 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