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Key terms: grid km system square map z wgs west north os datum east lines airy grid reference coordinate origin letter point corner ireland true ordnance survey digits guide ellipsoid longitude great britain lies latitude coast numeric contain national grid transformation channel context projection location northern m square abbreviated datum shift unit of area false origin world geodetic system coordinate systems airy ellipsoid grid reference system central meridian Search external links cited by footnotes on Wikipedia page British national grid reference system: |
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