In this video, we’ll take a quick look at the Compass page on the Garmin eTrex 20.
On the page, you have a few options: customize data fields and add change the course pointer. CDI (Course deviation indicator) can be a useful tool for those who does search & rescue, orienteering where you would want to know the drift (going off course) as you are navigating.
You can customize the data fields on screen by selecting MENU | DATA FIELDS and selecting from the choices available. You can add up to 4 data fields.