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Old 25-11-2015, 14:21   #1
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OpenCPN and DSC alert ? What about ?

Hello Dave, Hello all,

A thread on a French forum appeals to me. And we realize that we do not know what to say or think.
This is to say what happens when a boat emits a distress call (mayday) on a DSC VHF or when a major station relaying such messages.
A NMEA sentence it is generated by the VHF to receiving the alert message? If so, how he reacts OpenCPN?

Some ASN AIS VHF have two wires, one to transfer the AIS sentences, the other for transferring data on a "mayday". OpenCPN it can capitalize on?

Thank by advance. Gilletarom.
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Old 25-11-2015, 15:15   #2
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Re: OpenCPN and DSC alert ? What about ?

Gilletarom,

here:
DSC and Buddy via AIS. | Official OpenCPN Homepage
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Old 25-11-2015, 16:04   #3
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Re: OpenCPN and DSC alert ? What about ?

Dave had set up the opening of a window in case one of the two DSE or DSC sentences came in the PC.

Alas, no one, here in France, has seen this window open.

We do not know if it's because of OpenCPN or because our VHF.
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Old 26-11-2015, 00:31   #4
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Re: OpenCPN and DSC alert ? What about ?

First, I think, DSC distress calls in real life are very rare plus having somebody in reach with the VHF connected to OCPN is another hurdle.

The Tx side of the VHF has to be connected to input into OCPN (or a multiplexer). If you are getting the GPS data from your radio, then the DSC sentences should appear as well.

Perhaps the easiest(?) the test would go o one of the radio schools where one trains DSC calls, hook the system up there and have a look - given that they use radios which output DSC...
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Old 26-11-2015, 04:23   #5
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Re: OpenCPN and DSC alert ? What about ?

Hello Dave,

Using NMEA files that I download from thingie, I see that, with two different files, the window that is opened is not the same.

Why ?
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Old 26-11-2015, 07:13   #6
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Re: OpenCPN and DSC alert ? What about ?

Gilletarom...

Two different types of alerts.

One is SART, which is a SearchAndRescueTransponder. The MMSI starts with 97..... This might be from a PLB on man overboard, for instance.

The other is a general "Distress" alert, coming from a specific vessel, presumably by crew activating a switch on the transponder. These are occasionally seen as false alerts, for testing.

Both are very rare, thankfully.

Dave
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Old 26-11-2015, 09:36   #7
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Re: OpenCPN and DSC alert ? What about ?

Hello Dave, hello Hubert,

Thank you.

So I updated the shoreline.fr french web site.
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