WGS84/ETRS89
Reference for GPS & online maps of the British Isles GPS-compatible
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OSGB36
Used as graticule markings on Ordnance Survey maps of Great Britain Not GPS-compatible
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ED50 (European Datum)
Used as graticule markings for some international maps of the British Isles Not GPS-compatible
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Grid Ref. [2-letter Square ID]
Used on OS maps since 1952
Grid Ref. [Numeric Square ID]
Used on OS maps 1945-1952
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Full Co-ordinates
Full ref., used on OS maps since 1945
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ED50 datum (Intl. 1924 ellipsoid)
Used on some international maps of GB
WGS84/ETRS89 datum
Used as international grid referencing
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Great Britain National Yard Grid
Used on OS small-scale maps 1931-1945
Full Co-ordinates
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Grid Reference
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Full Co-ordinates
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Cassini (Delamere) Projection Co-ordinates
Used as the basis for OS small-scale maps of England & Wales from 1870s (+ Scotland from 1920s) to 1945
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Bonne Projection (Scotland) Co-ordinates
Used as the basis for OS small-scale maps of Scotland from the 1850s to the 1920s.
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Raw Projection Co-ordinates
Projection origin:
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Possible Alternative Counties (click to load results)
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Sheet Co-ordinates (derivative sheets are not guaranteed to exist)
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Page last updated: 4 May 2009
Build Version: 1.2.003