I stopped looking at the elevation, if I'm walking are standing still.
If your driving it works better, but still not sure if its right.
Last year I driving on a small highway in central Lousianna, (Hwy 28) The magallen said -20. I could see this reading in New olreans but not in middle of the state.
I drive a truck for a living, not sure which device I like best Magallen or Nokia
No wait the magallen is, it doesn't talk back
W Ray
Madison Ms