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HomeHomeDiscussionsDiscussionsiFly Owners Q&AiFly Owners Q&ADo we always see ourselves as traffic on ADS-B?Do we always see ourselves as traffic on ADS-B?
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8/31/2014 4:32 PM
 

A little advice, please. I've used ifly 700/720 with SkyRadar the last couple of years and usually only see other traffic on it, when nearby a terminal area. Only twice have I seen a return that seemed to be me. Both times I didn't trust that it was me (couple of hundred feet off in altitude, probably my transponder reporting error. I wound up doing a wide 360 turn, looking all around to see if someone else was there. Each time the track/target went away while I was in the turn.

Is it in the design of this equipment that we will see ourselves presented as a target?

If so, why only twice over the 2 years did I see myself?

And, if seeing our own target is normal/in the design, why did the target disappear both times I made a turn to find it?

I'd like not to make useless turns while still not worrying that I'm missing a nearby target.

Thanks for any info or advice.

Doug

 
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9/1/2014 5:13 PM
 

I have the same problem of false targets and also of showing the false target several hundred feet different then myself. It isn't your transponder's fault according to Shane. It's connected to the ground system being confused by a difference between GPS altitude and pressure altitude. He says this is a known problem that's being worked on by whoever the ADSB prople are. It's not a iFly or SkyGuard problem. Scary, isn't it! If you suddenly get very loud wind noise and you are rapidly losing altitude it wasn't a false target after all.

 
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9/2/2014 7:21 AM
 

Doug said:

Is it in the design of this equipment that we will see ourselves presented as a target?

If so, why only twice over the 2 years did I see myself?

The answer is that your position _is_ (or at least, "can be") included in the list of traffic targets delivered to you via ADSB.

Knowing that it's not desired to see your own self as a target, the iFly software uses logic to try to determine when a target is actually you, and filter it out. It generally does a pretty good job of that, which is why you don't often see yourself.

However, there's no way to perfectly determine if a target is you if you don't also have an ADSB-out transmitter. (In that case, your N-number will be included as part of the target data, so that makes it easy to filter out.)

So, occasionally, the logic fails to identify your own target and it gets shown to you.

 
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9/2/2014 10:01 PM
 

Thanks you guys. I kinda thought that, but your experience and knowledge validates what I think I might know, and fly with a little more comfort with this system.

 
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HomeHomeDiscussionsDiscussionsiFly Owners Q&AiFly Owners Q&ADo we always see ourselves as traffic on ADS-B?Do we always see ourselves as traffic on ADS-B?