John Doyle

I was under the impression that only ADS-B Out equipped aircraft would show as traffic on a display fed from an ADS-B receiver.  I use a Stratux to send traffic to my iPad using the FlyQ EFB.  The other day we departed an airport with 4 other airplanes in our group, 2 equipped with ADS-B out and 2 with standard Mode C transponders and no ADS-B Out installed.  I was within 5 miles of each aircraft and received all of them on my iPad as traffic.  The 2 ADS-B Out equipped showed their N-number and relative altitude.  The 2 who were just Mode C also showed up but just with a triangle and relative altitude.  They might have shown a direction of flight barb but I can't remember. 

Why could I see all the airplanes on my iPad?  I have TIS radar capability on my Garmin 750 and they didn't show up on the 750 as TIS traffic.  We were about 50 miles from any airport with TIS radar and below 2000' AGL plus the 750 indicated the TIS was unavailable so I don't think that is the answer.  

Also, can anyone explain the "hockey puck" of 30 nm radius and a few thousand feet deep? 

Thanks

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I was under the impression that only ADS-B Out equipped aircraft would show as traffic on a display fed from an ADS-B receiver.  I use a Stratux to send traffic to my iPad using the FlyQ EFB.  The other day we departed an airport with 4 other airplanes in our group, 2 equipped with ADS-B out and 2 with standard Mode C transponders and no ADS-B Out installed.  I was within 5 miles of each aircraft and received all of them on my iPad as traffic.  The 2 ADS-B Out equipped showed their ... more