6^ MRSC BARI MMSI: 992476132 - filtered out

[Olivier ELIZON]

hello,

Italy has implemented several reference navigation points that are AIS ground stations with their MRCC and MRSC (central in Rome and regional centers).

In order to ease the sailors to find the MMSI of these centers, each center is emetting an AIS Signal.

However, to make sure they don't confuse the sailors, they have decided to name them like this : 

6^ MRSC BARI
MMSI: 992476132

(this is the bari one but it's the same for all italian MRSC and the MRCC in Rome)

Please note that these reference points have huge coverage : almost all over mediterrannea.

When I connect directly a laptop to my device, I can see them. 

When I am using kplex, these stations are disparearing, thus I think there is a kind of filter due to special caracter in the station name.

Apparently, these are filtered out by kplex.

I think this is because of the special caracter ^ in the station name.

Could you have a look into this please ?

many thanks

Olivier ELIZON

[Keith Young]

Could you post the actual message you believe is being filtered out?  If this is part of an AIS sentence there's no reason it should be being filtered out.  If it's data that's not being transmitted in NMEA-0183 format it won't be being forwarded

[Keith Young]

To re-iterate, kplex shouldn't be filtering out any characters from the body of an AIS message and in any case, the station name will be encoded: https://gpsd.gitlab.io/gpsd/AIVDM.html

I'm not sure whether you mean you're losing some AIS sentences or if the station name and MMSI are being transmitted independently: Could you give me an example of the data which is problematic, i.e. an NMEA sentence which is being dropped?

[Olivier ELIZON]

hello, thanks for your email and insights about this.

In fact, I believe you are fully right, there is no filtering :-)

it is just that I was confused : 

- I had a failure on my AIS receiver (based on raspberry)

- and at the same time, I think Italian authorities changed their base station settings by reducing transmit power.

I have just seen an italian base station appearing with these strange ^ in the name (this one is in Napoly, Italy, and I get this signal from Antibes, France which is at 358 NM from my position  !!!).

 And from where I am (Antibes, France), it is really unlikely that I can capture VHF signal from Napoly

so even if this caracter ^ is not in the NMEA definition, it's still going through and this is just great!!

have a nice weekend!

and keep going with good work !

Olivier Elizon

Le mar. 13 juin 2023 à 20:45, Keith Young <strip...@gmail.com> a écrit :

To re-iterate, kplex shouldn't be filtering out any characters from the body of an AIS message and in any case, the station name will be encoded: https://gpsd.gitlab.io/gpsd/AIVDM.html

I'm not sure whether you mean you're losing some AIS sentences or if the station name and MMSI are being transmitted independently: Could you give me an example of the data which is problematic, i.e. an NMEA sentence which is being dropped?

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