In ref to previous discussion here : https://forums.garmin.com/showthread.php?371913-Multiple-map-layers&p=967149#post967149
I confirm : with a navigation course, it is not possible to display the map on full screen : whatever your config is for the map (0 datafield in my case), the bottom of the screen always shows the distance to the end of the course (or distance to the course if you are off course)
Very disappointed because I prefer to enjoy a "full screen" map, that is still not easy to see during a trail :confused::mad: