Ordnance Survey National Grid
To use the Ordnance Survey National Grid (aka OSNG, OSGB, British National Grid, BNG) in MilGPS:
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Go to Settings -> Datums and Location Formats.
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Set datum to Ordnance Survey National Grid 1936 (OSGB36).
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Set format to one of the Ordnance Survey National Grid (OSNG) formats.
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Save changes.