Trying to hookup GPS (ST60, S3G, ST6002), icom m234G & brookhouse

[Martenhaven]

Hi!

I''ve been struggling to hookup my integrated vhf GPS to opencpn on Mac (and tried windows too). I'm using a brookhouse imux-st multiplexer. When I look at the nmea messaging I see the following NMEA sentence: $CDRMC,134706.000,A,5227.7017,N,00502.3671,E,0.01, 139.22,280918,,,A*7E

However when I look at the instrument panel in openCpn is see the following gps position: 52.27.479N, 005 02 646 E

When I use the openCpnDebugger it shows Cog: nan, Hdm: nan, Hdt: nan, Lat: 52.458000, Lon: 5.044100, Sog: nan, Var: 1.329077, nSats: 0, Fixtime: 0
(althoug it shows this even when the computer is not connected).

Please help me!

Thanks!!!!!

Marten

[nohal]

Can you please record a few seconds of your NMEA data stream with the VDR plugin and post it here?

52.458000 == 52 27.479N and as OpenCPN never does anything to change the received position information, it is likely coming from somewhere...

Pavel

[rooiedirk]

Marten,
I'm not sure why (yet) but OpenCPN rejects the talkerID 'CD' for a RMC message. If I change your sentence to:
$xxRMC,134706.000,A,5227.7017,N,00502.3671,E,0.01, 139.22,280918,,,A
it works fine.
As a workaround you could use the nmeaconverter plugin to change the talkerID.

[nohal]

CD as a talker id in the NMEA stream is allowed only as a source of DSx messages. As it is now clear that there may be DSC radios providing position, it sure can be considered a bug and https://github.com/OpenCPN/OpenCPN/b...lexer.cpp#L268 should be replaced with something smarter.

[rooiedirk]

Originally Posted by nohal

CD as a talker id in the NMEA stream is allowed only as a source of DSx messages. As it is now clear that there may be DSC radios providing position, it sure can be considered a bug and https://github.com/OpenCPN/OpenCPN/b...lexer.cpp#L268 should be replaced with something smarter.

Change that line into

message.Mid(1,3).IsSameAs(_T("CDD")) ||

or

message.Mid(1,4).IsSameAs(_T("CDDS")) ||

should do the trick.
(The only message types starting with D are
DBK - Depth Below Keel
DBS - Depth Below Surface
DBT - Depth below transducer
DCN - Decca Position
DPT - Depth of Water
None of them are to be expected from a radio set)


If TS is able to compile it is a simple change. Otherwise I suggest again the nmea-converter-PI as workaround.

[rooiedirk]

Did a pull request for this one. So it should be fixed in the upcoming release.

[Martenhaven]

Thanks all!!!!

Tried to use the nmea converter myself for the first time but need to do some more playing around (tried to do $CDRMC, $GPRMC) but that gave an interesting crash of OpenCpn.

Tried to get my brookhouse to do the conversion but for some miraculous reason it only accepts *E (end of directives). Anything else it just doesn't respond.

Will try the solution mentioned and wait patiently for the new version with the fix

Again thanks!

Marten