How can I use the DJI GS Pro - Waypoint Flight Route - With Aircraft Recorded Altitude, below 0 (take of point)? I launch from a hill area and most of the point I need to record are below me. When I try to record these lower points they come in at 3.3 ft. Thanks.

When you try to map a waypoint  set, do you use the Advanced section? You should be able to map waypoints in this area.