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Old 04-01-2023, 02:33 PM   #1
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Fake AIS targets - WTF is going on here?

Weird sighting on marine traffic @ Bundaberg Australia a few months back.
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Old 04-01-2023, 02:36 PM   #2
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After a 32 day stint out at the reef we arrived in Bundy yesterday afternoon

On anchoring, one of the targets was showing on AIS behind us
Thing is, in real life , looking out the back, there is nothing there
But on my chart plotter it to sees it there as a 200 metre long vessel destination, cassablanca.

To make things even more bizarre it moved down towards the trawlers in bottom left of pic but over land and then back to us again.
And, on marine traffic if you click on the target, it has a name change from Nauticast to Sea Melody.

On the way in to Bundy, on my chart plotter it was showing as Main Event - but, there is no vessel on marine traffic in Bundy called Main Event and there isn't one on the plotter now either.

Bottom pic a few hours later has it over land on the north side of river.
This morning back on land on South side.

It's doing my head in.
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Old 04-01-2023, 02:40 PM   #3
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Typical UFO flight pattern
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Old 04-01-2023, 03:12 PM   #4
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I would guess a faulty GPS feeding the AIS. Or perhaps a faulty AIS device itself.
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Old 04-01-2023, 03:24 PM   #5
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Greetings,
April fool's joke???
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Old 04-01-2023, 03:25 PM   #6
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Couple of possibilities:

First, the target position appearing on your or anyone else's chart plotter is a function of the AIS's GPS on the target. Simply, a target with a faulty GPS as part of its AIS can have the target appearing on your plotter, where it's not physically located. I use to use a tablet with a built in GPS for Aquamaps. The GPS went flacky and Aquamaps had me traveling through a golf course.

Secondly, if someone is pranking, the older AIS (like I had on my charter boat) were all user programmable. All the information (including vessel name) was entered by the user. Was common to see targets with no name, an MMSI number, and occasionally a made up name.

Then there are those who leave their AIS on while the boat is going down the road.....on a trailer behind a car.

Ted
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Old 04-01-2023, 03:30 PM   #7
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Taken just now showing Nauticast to Sea Melody name change.

April fools joke?
No, first two pics were screencapped on Feb 2
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Old 04-01-2023, 03:58 PM   #8
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Just poor GPS stability. Could be a partially obstructed GPS antenna blocking some of the satellites.
No clue what's up with the name change stuff.
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Old 04-01-2023, 04:15 PM   #9
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Quote:
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Just poor GPS stability. Could be a partially obstructed GPS antenna blocking some of the satellites.
That might explain position changes
But not the name changes from Main Event to Nauticast to Sea Melody.
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Old 04-01-2023, 04:24 PM   #10
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Greetings,
Mr. S. marinetraffic.com shows Nauticast exactly where your screenshot shows. On shore. Might it be a satellite problem/malfunction or some sort of jamming effort although I have no idea WHY anyone would jam signals. The world situation is chaotic but not THAT much. Would the Australian Coast Guard have any idea?


Edit: Nauticast is listed as being engaged in fishing and occupies the same space as MV Male Anch and Sea Melody (Pilot vessel-tug). VERY strange, indeed.
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Old 04-01-2023, 06:56 PM   #11
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Quote:
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That might explain position changes
But not the name changes from Main Event to Nauticast to Sea Melody.

Does the name change when viewed from your chart plotter, or just on Marine Traffic? Marine Traffic is a bit of a hack job, so I would take anything that it shows with a grain of salt.
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Old 04-01-2023, 07:19 PM   #12
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Greetings,
Mr. tt. Sorry that's all I have. Just trying to help.
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Old 04-01-2023, 08:03 PM   #13
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Does the name change when viewed from your chart plotter, or just on Marine Traffic? Marine Traffic is a bit of a hack job, so I would take anything that it shows with a grain of salt.
Did it on both

But on the plotter it was Main Event several miles out and now in close it's only Nauticast seen.
No Sea Melody or Main Event in the area.
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Old 04-01-2023, 08:04 PM   #14
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Quote:
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. Would the Australian Coast Guard have any idea?


.
Oz coastguard are a volunteer organisation with limited resources so I doubt it.
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Old 04-01-2023, 08:42 PM   #15
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Multiple MMSI's? Possibly a VHF radio (handheld?) or EPIRB acquired from another boat being used without updating details with AMSA. Although not sure that an EPIRB's GPS etc would be ON unless it was activated.
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Old 04-01-2023, 09:04 PM   #16
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Just went in to get fuel for tender.
Main Event is the 2nd Lady Musgrave boat they have and is tied up.
Girl at marina office said it hasn't been moved this year.
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Old 04-02-2023, 02:34 AM   #17
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Has to be a transmission from a portable AIS, whether a handheld radio or PLB or some such. Also from the name changes and such it is likely after a sale of the boat and before any registration changes. When the new owner figures out how to turn it off and gets the reg done all will return to normal.
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Old 04-02-2023, 02:53 AM   #18
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Hi,

this can also be intentional harassment, from a state. Here in Finland, along our border in the east and in northern Norway, GPS signals have been disturbed for a long time, and airplanes have had to change their routes when the GPS interferes. This is known that the question is an intentional harassment.

Maybe someone was upset when the information about the new submarine acquisitions was published...

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