auonsson Profile picture
Sep 2 6 tweets 2 min read Read on X
Pilot of the aircraft carrying president von der Leyen experienced GPS issues as they approached Plovdiv airport, Bulgaria Sun Aug 31.

Recordings of tower and plane comms are clear.

Transponder reported good GPS-signal and is likely separate from the instrument pilots used.
Half an hour after first reporting GPS-issues the aircraft of von der Leyen is taxiing on Plovdiv airport as the pilot repeats "we had GPS-issues" and thanks the flight controller for the support.

Full recordings with additional comms available at live-atc.net
From this we can derive that the pilot did *experience* GPS/GNSS-issues.

Given the area and years of jamming it is likely to have been caused by the common jamming of area. Other explanations are possible.
Some institutions/people yesterday concluded from the ADS-b data that there were no issues with GPS. In my opinion that was a faulty conclusion taken on a very weak basis.
There were likely several receivers on board and the one our pilot looked at seem to have had issues. Or the pilot made a mistake, we cant say for certain with this. The flight data recorder likely can though =)
It is realistically possible it was a directed attack on v d Leyen but to say that we need more data, unlikely to surface but hopefully looked into by Bulgarian services/military.

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More from @auonsson

Sep 1
The plane carrying EU top Ursula von der Leyen was forced to land manually after being hit by GPS/GNSS jamming.

News texts seem to indicate it was directed specifically at Von der Leyen and the airport Plovdiv.

"GPS around airport was knocked out for an hour."
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Read 17 tweets
Aug 22
Stockholm-Helsinki ferry SILJA SERENADE made a sharp turn for unknown reasons night between Tu & We. Owner claims weather and collision avoidance. There were damages to loose items.

But there was no other ship on AIS, no sharp turn registered and weather was calm. Image
Calm weather is substantiated by an anonymous maritime professional witness to YLE.

Heavy jamming? Malfunctions? Dark ship in the way? Submarine? Possible explanations are many but the one from the ferry company seem unfinished.

Tnx @akihheikkinen!

yle.fi/a/74-20178772Image
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@akihheikkinen Possibly related: last week American special forces exercised close to another ferry on the route.

alandstidningen.ax/nyheter/okanda…

businessinsider.com/swccs-operate-…
Read 5 tweets
Jul 15
Russian destroyer Vice Admiral Kulakov fended of a drone threat Monday in Fehmarn Belt, Baltic Sea, Danish EEZ.

The large ship made evasive maneuvers, employed some anti-drone machine and manned and aimed lighter guns.

All according to local news: archive.is/G5kotImage
DK Navy observed. Thanks anon follower.
As the Russian destroyer made high speed maneuvers with machine guns ready to fire she was surrounded by both commercial and leisure ship traffic.

In her immediate vicinity at most likely incident time were two large tankers and at least 5 sail boats. A few miles of Denmark.
Read 4 tweets
Jul 2
Swedish maritime authority just posted maybe their most extensive interference warning to date.

Even radar is now seeing interference, besides more familiar GNSS, AIS and DGPS.

Radar is the single most important navigational aid on ships, particularly in cases of lost GPS/GNSS. Image
Source:

And on the NAVTEX terminals. navvarn.sjofartsverket.se/Navigationsvar…Image
Read 5 tweets
Jun 29
South Baltic sea is experiencing a newish type of GNSS-jamming. It is affecting units at sea level far and wide, much further than one ground based jammer can reach.

The most intense attack so far took place as the political elite of Denmark and 100k visitors met at Bornholm.
Data for animation above is the signal levels that RINEX stations receive from various GNSS-constellations.
Last year a limited span of frequencies were affected. 2025 all frequencies/bands are affected. BeiDou, not illustrated (noisy).

The Bornholm station is used as example. Image
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Looking per station we can see the geographic and temporal reach.

South-east corner of Baltic is affected (but not all stations!) and with an intensified period right now.

It is also evident that the ongoing 2025 attacks result in a much more degraded signal to noise ratio. Image
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Read 12 tweets
Feb 15
There is an estimated 1 in 10k-100k years chance that all 8 of the Nov 2024 - Jan 2025 Baltic Sea cable breaks are coincidental.
Data is hard to get by but no matter which real data or reasonable assumption one picks it is very unlikely all 8 of them are explained by chance.
🧵 Image
Illustration of a 1 in 108 908 years chance that all 8 of the Nov 2024 - Jan 2025 Baltic Sea cable breaks happens with present background levels. Above is 1 in 10 609 years illustrated. Image
Two alternative ways of illustrating the extremely low probability of the Baltic Cable breaks being normal. Red dots in each, promise! Image
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Read 15 tweets

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