Garmin etrex 10 Manual page 22

It is also important to set the coordinate format within the EasyGPS software. This will ensure that the
waypoint's location stored in the GPS will be displayed in the same location within the software.
Within the 'My Coordinate Format' tab, select 'Add Format'. Within the location list, select 'World'. Within
the format list, select 'hddd.mmmm'. Within the datum list, select the 'World Geodetic System 1984'. The
following figures will help you identify how to select this coordinate format.
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Using your Garmin etrex® 10 GPS