Kneepuck
lvl.4
Flight distance : 275105 ft
United States
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It's because the Barometric altimeter, in order to be accurate, would need pretty much constant calibration, just as the ones in the large aircraft do.Weather conditions, temp, etc affect atmospheric pressure and that is what the Phantoms use to determine altitude. So for it to be accurate, we would need a way to calibrate it. It is not that sophisticated. It just records the reading at startup and uses that for a baseline. Temp changes, pressure changes it records as altitude changes even if the P3 is just sitting on the ground. And for VPS to be perfectly accurate would require perfect conditions as well. Thus, we as pilots have to consider all this stuff all the time. Maybe one day we will get radar altimeters. Until then.....
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