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Old 01-05-2022, 04:37 PM
dmattmul dmattmul is online now
Join Date: Dec 2015
Location: Spring Hill, FL
Posts: 296
Default Ghost image on ADSB

Hopefully I can describe this correctly and one of the more strangest things that has occurred to me in the air. Maybe more high time pilots think this is normal but it was a little unnerving. Took off today for a short trip to JAX from TPA. About a third of the way there noticed I had "traffic" about 2 miles off my right wing same altitude same direction. Since I was heading for a corner of a MOA thought this airframe doing the same and did not want to meet at the same spot. By then was seeing 1 mile off my right wing. Decided to climb 2,000 ft. and the intruder did the same, albeit some delay. Now at 0.5 miles. Decided to do a 360 and about half way through started getting collision alerts. Still no joy seeing the pesky dot in the sky. This time after the 360 he was 0.5 miles off my left wing. Decided this must be some issue with my ADSB and flew to JAX and landed hoping after a 2 hour visit with my Dad could return home. Took off and after 20 mins same scenario except noticed other traffic having "guests" about 1 to 2 miles away from them. The primary target had N number recognition and the "guest" would not. Same as my guest. Finally called ATC for flight following and asked if they saw anything. Was informed they where having "radar issues" and multiple airframes had seen these today. I've never heard of this? Should ATC report when they are having radar "issues"?
RV-14A QB building, Lycoming 390 Thunderbolt arrived July 2019, Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 300-72, EarthX batteries, Parts became a real airplane 8/15/2020.
Started RV-10 Nov 2020. Empennage arrived (Built) Working on QB kits. Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 3 blade, EarthX batteries, real airplane hopefully early 2024. Paid subscriber and more. (Worth every dollar contributed).
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Old 01-05-2022, 05:04 PM
wawrzynskivp wawrzynskivp is offline
Join Date: Feb 2018
Location: Incline Village Nv
Posts: 308
Default ADS-B track validity

I have seen these as well.

Some help may be gleaned by recognizing which targets are truly local ADS-B emitters and which are coming aboard via TIS, your display should help with that.

Some perspective may also help in that our use of ADS-B 'In' was a negotiated arrangement and not really the original mission of the system. We sometimes hear ATC communicating traffic to an airplane hoping that the pilot can report it visually, and the pilot comes back with 'see it on my scope' or some such answer which isn't terribly helpful to ATC since our ADS-B 'In' isn't meant to make ourselves into ATC traffic separators. See and avoid is what is desired in that moment and seeing ADS-B 'In' isn't sufficient, or reliable.

It is akin to when FIS isn't available or is having problems. Other than figuring it out on our end who would be responsible to tell us?

Last edited by wawrzynskivp : 01-05-2022 at 05:06 PM.
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Old 01-06-2022, 03:50 PM
Wonderboy Wonderboy is offline
Join Date: Aug 2018
Location: New Hampshire
Posts: 24

I fly out of FHB and regularly run into GPS failure, ADSB ghosts and occasional GPS reporting incorrect location. I do not have these issues in other parts of the State nor on longer cross country trips. It may be coincindetal that Kings Bay sub base and the JAX NAS and NS Mayport base are all located nearby and that the navy does do electronic jamming and spoofing of GPS. Or I could just be paranoid .

Last edited by Wonderboy : 01-06-2022 at 03:52 PM.
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