IO540 said (among other things)
the mag track is pointless
What's that when it's at home?
Both of the non moving map GPS I have used in the past (Garmin 12XL and Magellan 315) had the capability of navigating using aviation waypoints, showing your position relative to trackline, off-track error, ETA at next waypoint, distance to run, groundpeed etc.
Indeed an option on the 315 was a Jeppeson aviation databse you could upload into it and it ws sold, with this database bundled as the 320, for aviation use.
position relative to some user-defined waypoint is an accident looking for a place to happen
like VOR/DME you mean?
My GPSMAP 196 is less demanding to use, maybe that's a temptation to push the putton and go rather than properly plan what you want to do, which is necessary with the more basic GPS. (Just playing devil's advocate here
)
Mike