Jpf,
The elevation indicator, as I understand, is a function of how many satellites you are receiving. You have to have a certain number before that indicator will function.
I have an older Garmin product and it DOES have that feature on it. I assume that many if not all such products would have that available if it can access the minimum amount of birds.
And you are correct..... it is fun to look at the screen and see what your elevation is. I usually compare the road sign to the GPS..... usually within a reasonable number. I also compare the speed. The two systems are usually within tenths or hundreds of each other! It is amazing.
Happy travels.
HamRad
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