Setting the Map Datum to GDA 94 on Garmin watches
Ok, because this is typically a "Set once and forget" setting, it will be easy to forget it in the future when you get a new watch or if you need to reset to factory defaults.
The default map Geocentric Datum of Australia is GDA94 and is the same we use in the RFS. That means the latitude/longitude grid reference on our printed maps are the same on the watch face.
To set the GPS display format on the watch:
Now when you long-press the GPS button it will display a 10 figure grid reference. For example:
Position: 56H KH 63241 MGRS 67108 Alt. 709
Map Datum Supported by Garmin GPS Devices