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Misleading traffic alert messages


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Gilest
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Posts: 9, Visits: 1
Hi I am using SD 38172 in iPhone connected to a Pilot Aware device with bearingless targets displayed.

On a recent flight I was surprised to receive an alert on screen warning about traffic "behind". Firstly I was not sure how you could tell that the traffic was behind being bearingless and more worryingly when I played the track back using Flight Aware the aircraft was actually ahead.

Thanks

Giles
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Ian Melville
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Posts: 4, Visits: 1
Hi Tim, just registered on here to stop cross forum posting etc.
A‌s Giles has said, I have been experiencing this for a month or more now. I have been using SD and PAW for over 12 moths now, so something changed that has caused or highlighted a hidden issue. When I first experienced the issue I was using a 1st generation iPad mini, which was running very slow. I would get an audio alarm of the traffic, and a message would pop up on the screen long enough to read it easily. I have since wiped that iPad Mini and it is running quicker. Now the alarm is still the same, but the message flashes on the screen so fast that it is not possible to read all of it, certainly too fast to take a screen shot. Most, if not all the traffic is mode S, so I am able to see a call sign and the fact the traffic is behind me. Sadly PAW playback does not playback bearing-less targets.

I‌ have come to a similar conclusion as you‌ mention in the above post. The alarm/alert is only received when in I in motion, and it does not have to be very fast. I suspect it is seeing the position of the alarm symbol (red ring) generated at my position, and my new position when it updates. That would make the bandit always in my six. Would that be down the order the code modules were processed?

What I find surprising is that there are not more reports of this issue. Is it something that Giles and I have set, that others do not? or is it because we are all keeping our distance in flight?

I‌ find it easier to produce when driving for some reason, as I don't normally let other aircraft get that close‌. Should this make any difference?
I‌ will have a go at videoing the screen over the next few days, but will be away on holiday for next week.

C‌heers
I‌an‌
SD V‌ersion 3.8.1.72‌
Edited 7/6/2017 10:49:30 AM by Ian Melville
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