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Data source: EPSG
Information source: Defence Geographic Centre
Revision date: 2015-11-25
Target unit: metre
Remarks: Uses Sear's 1922 British yard-metre ratio (UoM code 9040) truncated to 6 significant figures; this truncated ratio (0.914398, UoM code 9099) then converted to other imperial units. 3 ftSe(T) = 1 ydSe(T).