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Old 06-04-2012, 18:43   #1
JF2
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No COG, SOG

Hi,

First post ever on a forum. Problem with Open CPN (2.5.0). Have GPS coordinates for boat position, but can't get SOG or COG data.

Anyone can help ?

Many thanks,

JF
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Old 06-04-2012, 18:59   #2
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Re: No COG, SOG

Hi Jf


welcome to the forum!

would be interesting to see what data your GPS is sending.

turn on the data stream window in "Toolbox/GPS", enlarge the data window a bit, and let us see some bits...

Dirk
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Old 06-04-2012, 19:05   #3
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Re: No COG, SOG

JF2, If you have the gps happening, you can configure the dashboard to show COG+SOG and whatever you like

help file..
The Dashboard PlugIn | Official OpenCPN Homepage

that is, you can configure the "Dashboard" plugin to show SOG and COG in various size and fonts...click the Wrench, choose Plugins tab, click dashboard, click preferences and commence configurating! The dashboard window can be resized by dragging edges and corners...
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Old 06-04-2012, 22:00   #4
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Re: No COG, SOG

Thanks happy seagull, already tried that part. Seems that Open CPN just can't turn the GPS signal into COG or SOG.

Dirk, here's a typical line I get.

15 :43 :05 $GPGSV,3,2,06,29,19,232,36,13,06,130,36,,,,,,,,*70

Thanks !
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Old 06-04-2012, 22:10   #5
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Re: No COG, SOG

Hi JF

the GPGSV wouldn't even give position, I think. There must be more:

Examples:

GPGGA: fix data
GPGLL: Lat/Lon data
GPGSA: overall satellite reception data
GPGSV: detailed satellite data
GPRMB: minimum recommended data when following a route
GPRMC: minimum recommended data

It would be good to know which sentences your OpenCPN is receiving.


Which GPS are you using?


Dirk
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Old 06-04-2012, 22:17   #6
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Re: No COG, SOG

Looked at the stream for a couple of minutes and saw these.
GPGLL
GPGGA
GPGSV
GPGSA
I use a Magellan handheld GPS, model triton.

Tks
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Old 06-04-2012, 22:34   #7
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Re: No COG, SOG

Yuck!

no GPRMC? Which triton (trying to find the manual)?

Tritonforum.com • View topic - $GPRMC in NMEA

Next step: A recording of your NMEA data from the GPS and replicate the problem. There are several tools, including opencpn in debug mode. How comfortable are you editing config&ini files?

I am off to bed for now... see ya tomorrow!

Dirk
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Old 06-04-2012, 23:05   #8
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Re: No COG, SOG

Hi Dick,

The model is the Triton 400. I went to see the link you sent regarding the triton forum, very useful. Perhaps they upgraded the software in the GPS. The version I have dates back to 2008. I'll try this lead.

Regarding your question, let me say that I am spectacularely unfamiliar with any type of programming.

I'm in New Zealand, so time for me to have dinner !

Thanks for your kind help. No big deal if I can't sort this one.
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Old 07-04-2012, 03:41   #9
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Re: No COG, SOG

I know this is a silly question but are you actually moving
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Old 07-04-2012, 06:44   #10
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Re: No COG, SOG

Quote:
Originally Posted by r.fairman View Post
I know this is a silly question but are you actually moving
Most GPS will send a SOG ~0.0 and a random COG when at standstill. But JF's Triton 400 doesn't seem to send the needed NMEA sentence, weird.
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Old 07-04-2012, 06:46   #11
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Re: No COG, SOG

JF

easiest way to record NMEA data from within OpenCPN is to use the plug-in "VDR" = Voyage data recorder.

Get it from
PlugIns | Official OpenCPN Homepage

Record ~10 secs of NMEA data, and publish the results

Dirk
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Old 07-04-2012, 22:12   #12
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Re: No COG, SOG

Hi,

Went to Magellan's website and downloaded an updated software for the handheld. FIXED THE PROBLEM !

Thanks Dick for the link to the Triton forum and for your help in solving my problem.

Cheers and happy cuising !

JF
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