I tracked an aircraft on the map after take off - but then it timed-out (probably due to obstructions) But it eventually reappeared on the list - but disappeared totally off the map.
My question: will all aircraft turn off/turn on their position & so be intermittent on the map?
I thought that a/c detected would either be permanently off or permanently on the map?
Can anyone adise?
Kind Regards
Steve
Hi Steve,
I've just been looking at my screen after reading this post and your right. I just had 5 aircraft in my flights 1 non ADSB D-ALCH + 4 ABSB G-BMRB G-FZDF PH-AAX + G-OOBC
only G-BMRB was showing on map before it disapeared at the edge of my polar diagram near the Wash (east coast) the other 3 were showing in myflights for a couple of minutes before they started to appear at various points on my polar diagram moving inland.
So it appears as if the signal for flight ID (hex code) is stronger than that for the position data, thats the only way I can explain what I've just seen.
Or is it the ID is constant but position is dependant on a request from a ground station?
I know there is a delay set in preferances for how long a flight stays in mylog after signal is lost but I cant explain the other way around.
HTH John
Would also like to why this is
Jonjo
The specific messages with the positional data are longer than those just for the Flight ID and altitude.
Therefore as you approach the edge of your reception the positional messages are harder to reciever (longer therefore more likely to be corrupted). So its likely aircraft will appear with a globe on the MyFlights list first and then appear with positional details and then without a globe as it leaves your reception area.
Quote from: AirNav Support on May 24, 2009, 10:25:17 AM
The specific messages with the positional data are longer than those just for the Flight ID and altitude.
I think you mean
squawk and altitude - those are the two data items that are sent in 56-bit Mode S messages. Flight ID is always sent in a 112-bit message, although of course that normally only needs to be decoded successfully once as it shouldn't change in mid-flight.
in my map there are places where marks disappear from airplanes, and then they appear after a while . I suspect that errors are in the coordinate scale of map.