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  • Question Mark on Map




    Why some planes have a question mark?


  • #2
    What do you mean missing? It cannot be missing especially if it is a passenger flight.

    Thanks.

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    • #3
      I see. Sometimes the question mark can be of bad signal.

      Keep it up. Good system.

      Comment


      • #4
        the "?" symbol appears when the ads-b receiver temporary lose signal from an certain plane. I live at Pisa about 50km from the place shown in your print screen, as i know the receiver from this area is located at Florence, and because of the sounding mountains there area different areas and different flight levels (low FL) in which the signal from the plane can't reach to the ADSB receiver.For example over Pisa airport you can see the traffic flying at 10000 meter but you cant see the planes who are departing from Pisa airport until they reach ~3000 meters, and the planes that are landing can be seen until the descend under ~3000, because the signal around the airport is shielded by the sounding mountains.

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