Originally Posted by vbalddave
I don't want to cause thread drift here, but how do GPS speedometers give a true ground speed reading when the vehicle is going uphill or downhill?

Dave


3 Dimensional trilateration using at least 4 intersecting spheres.

https://electronics.howstuffworks.com/gadgets/travel/gps.htm

Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE