It is not just the VFR guys that become dependent on the GPS and not question what it says.
Wish I had a beer for every time I heard enroute ATC ask us and others for "latest estimate GAFER" or wherever once we had levelled off at F290/F350 or "latest estimate YWUP"....
Obviously they are asking because some jokers that sit in turboprops and older turbojets don't factor in the TAS and groundspeed changes during climb/descent and just read the ETA off the screen based on present speed
