Could any of you kind folk please explain to me (or provide a link to where I can find out) how the altimeter really works on the Vista HCx?
What I cannot figure out from the brief description in the Owner's Manual is exactly what happens if one does (or does not) "calibrate" the altimeter.
Is the pressure reported always a raw sensor reading, or does it try to correct for elevation to get a number that could be validly compared with a weather report pressure?
What happens if you select "Calibrate Altimeter" and give it a known elevation which the unit finds to be inconsistent with the best value it can figure out from the satellites?
If I choose not to calibrate, and then go far a long walk along a reasonably level road during a period of falling atmospheric pressure, should I expect to see a progressively increasing elevation value along the way?
In other words, will the unit see the reduction in pressure and regard that as a more reliable indicator of elevation than what the satellite data indicates? Or does it use a more complex rule depending on its assessment of the accuracy of the satellite based elevation value?