Ken Reed wrote:
After takeoff at North Platte, we actually saw (briefly) a ground speed on the GPS of 31kts!!

One trip a few years ago, El Paso to Tucson at the MEA of 12,000 ft, I
had a GPS ground speed for a portion of the flight in cruise of 27 kts.
In a Mooney. Well over 100 kt headwinds.
---
Ken Reed
M20M, N9124X

I came to a complete stop (groundspeed) in a C-182T near Detroit a
couple of years ago, we then backed up at -40kts (just because we
could) and turned around and left the area at 237kts groundspeed (my
personal record in a 182).

I'm sure the folks on the ground would have been concerned had they
seen us stopped at 8500' for about 10 minutes.

Eric