What was generating the ground speed?
Reason I ask is that DME
groundspeed is only correct when flying directly TO
or FROM the station. When you are flying tangent to the station the rate of change is so slow I've seen groundspeed drop to zero while doing 180 knots in a Cessna 404.
Was this GPS generated?
Funny, but in all the years I flew STOL airplanes, good ones, I never got the chance to stop or back up.
Happiness is not seeing another trite Ste. Maarten photo all week long.