•The
British National Grid (BNG) is based on the National Grid System of England,
administered by the British Ordnance Survey. The true origin of the system is
at 49 degrees north latitude and 2 degrees west longitude. The false origin is
400 km west and 100 km north. Scale at the central meridian is 0.9996. The
first BNG designator defines a 500 km square. The second designator defines a
100 km square. The remaining numeric characters define 10 km, 1 km, 100 m, 10
m, or 1 m eastings and northings.
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