@maszop it can be very accurate, but again: why infer when you can extract? I see FusedAlti as excellent, when you don’t have a topo map with a pin on it to look at. When you know where you are on a topo map, you don’t need the overhead as primary.
Put another way, in my scenario above: you have a recent barometric pressure reading for somewhere near you - let’s say an airport - do you claibrate to that, or do you calibrate to the sign that you’re standing next to that states the altitude, as measured by RADAR?
I think there’s a bug in the most recent firmware; two times since updating, I’ve come back from an activity and my altimeter has been way off. Really odd: perfect the whole time, then I stop, save, and I think it was 60m off or something.