Datum Shifts

Latitude and longitude coordinates depend on the datum used for the map projection. The same point, on maps with different datums, will have different coordinates which can vary by several hundred meters. 

Region Local Datum UTM difference to WGS84 Lat/Long Difference to WGS84
US NAD27 200-220 m 0-100 m
Afghanistan Indian 276-283 m 25-105 m
Korea Tokyo 730-760 m 332-400 m

Last revision 9/15/2015