Take into account the World Geodetic System, and preferably use WGS84:
http://en.wikipedia.org/wiki/World_Geodetic_System
Support for other coordinate systems might be required ( using conversion methods ) but all calculations should be done in one standard.
Take into account the World Geodetic System, and preferably use WGS84:
http://en.wikipedia.org/wiki/World_Geodetic_System
Support for other coordinate systems might be required ( using conversion methods ) but all calculations should be done in one standard.