20260730 weird AIS signals

[W-Geronius]

for a couple of days, I have been witnessing a vessel moored close to me in the marina.
AvNav reports weird data: DST 1.4nm (varying), SOG 102kn (constantly!):

In AIS Catcher different data are displayed. DST is missing there as AIS catcher isn't aware of my position

Here are some AIS records emitted by this vessel:

AIS.txt

There are certainly bugs with that transmitter, like Channel A+B ? - I just wonder about SOG 102kn - that exact same speed was sporadically reported by another vessel, SAR, which is supposed to have a properly working transmitter - maybe there is a funny bug producing this exact value?

[PietKnot]

Is currently in Volendam-harbour: https://www.vesselfinder.com/?mmsi=244092364 with speed 3,8 kn? Same MMSI: 244.092.364

[wellenvogel]

Currently AvNav misses to detect some values that indicate "no data" in AIS messages. This needs to be corrected.

[W-Geronius]

I am experiencing major difficulties with my raspi at the moment, no clue what's happening.
Anyway, I am pretty sure, another error was introduced by update 20260813: all vessels symbols are now graphically oriented to HDT. As this value is missing for most ships here, they all point to north. The COG course vector looks ok. In my opinion, AIS targets should always point in COG direction (irrespective of my own boat's navigation display setting)

PS: scratch that. Sorry - there is a setting in AIS for that. Dunno why it was switched on

[wellenvogel]

BTW: HDT is the default - see e.g. #504