Position Format Settings
NOTE: You should not change the position format or the map datum coordinate system unless you are using a map or chart that specifies a different position format.
Select Setup > Position Format.
Position Format: Sets the position format in which a location reading appears.
Map Datum: Sets the coordinate system on which the map is structured.
Map Spheroid: Shows the coordinate system the device is using. The default coordinate system is WGS 84.