aburkefl
lvl.4
Flight distance : 78612 ft
United States
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I think the consensus seems to run between ridiculous and hilarious! Sometimes, the altitude numbers don't even seem to be "in the ballpark!"
I thought with three satellites one could calculate the altitude. I have a Garmin GPS (an Edge 810) that I use for bicycling - it *does* use the GPS to calculate both speed and altitude. For whatever reason, however, DJI opted not to use that particular algorithm and they use barometric pressure to calculate the altitude.
One of the math advantages with the DJI approach is that you don't have to know the actual height MSL (Mean Sea Level). No matter where you are, the ground is theoretically a level of zero feet. It does look funny though. If you take off on even a small cliff/hill, you can quickly get a negative value for your altitude. Looks funny until you get used to it.
Art - N4PJ
Leesburg, FL
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