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Old 12-02-2022, 04:40 PM
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NYTOM NYTOM is offline
Join Date: Jun 2005
Location: Raleigh, North Carolina
Posts: 1,216
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The responses have been very educational. Iím sure everyone is right about the on-line flight reporting services and their lack of accuracy compared to actual flight. In my ignorance I assumed all readings would be close if not the same. What brought this all to light was my concern for what altitude others were seeing me at in their cockpits. On nice days it can get pretty crowded on the East Coast and although I donít totally rely on it , itís nice to have a second set of electronic eyes watching for traffic. I WILL check it out with ATC on the next flight .
Tom Norwood
Classic "Short Tail 6A N822PM
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Old 12-02-2022, 10:42 PM
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GalinHdz GalinHdz is offline
Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,412

As I said before:
Originally Posted by GalinHdz View Post
GPS altitude is best for not colliding with things on the ground. Barometric altitude is best for not colliding with other aircraft.
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Old 12-03-2022, 01:14 AM
BobTurner BobTurner is online now
Join Date: Dec 2011
Location: Livermore, CA
Posts: 8,701

I think most adsb-in systems donít display target altitudes. Since adsb data contains both gps altitude and pressure altitude, the system displays an apples to apples difference: either the difference between target gps altitude and on-board gps altitude, or the difference between pressure altitudes. It then displays targets as 100í higher, 200 ft lower, etc. Either data difference should be accurate, easily understood, and you donít have to worry about actual indicated altitude.
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