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  #11  
Old 12-02-2022, 04:40 PM
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NYTOM NYTOM is offline
 
Join Date: Jun 2005
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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 .
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  #12  
Old 12-02-2022, 10:42 PM
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GalinHdz GalinHdz is offline
 
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As I said before:
Quote:
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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  #13  
Old 12-03-2022, 01:14 AM
BobTurner BobTurner is offline
 
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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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