GPS Not Seen

[champ8242]

No idea how to get screen shot of opencpn NMEA window. Will try with Hyper terminal.

If you are using Windows press key's alt+prnt scrn, open paint and paste the picture. Save as jpg and Attach in your message

[detroitsail]

David,

Here is NMEA data from Hyperterminal:

$IIWCV,0.00,N,
$IIWPL,4200.005,N,01925.540,W,001
$IIXTE,A,A,00.000,L,N
$IIBWC,,,,,,062.99,T,069.99,M,03.900,N,
$IIDBT,007.48,f,002.28,M,001.23,F
$IIGLL,4221.451,N,08257.210,W,011107,A
$IIHDM,122,M
$IIHDT,112,T
$IIMWD,061.16,T,068.16,M,07.21,N,03.71,M
$IIVDR,225.00,T,231.99,M,0.00,N
$IIVHW,109,T,116,M,00.00,N,00.00,K
$IIVPW,0.00,N,,
$IIVTG,304.90,T,311.90,M,0.00,N,,
$IIVWR,041,L,06.84,N,03.52,M,,
$IIVWT,041,L,06.82,N,03.51,M,,
$IIHDT,102,T
$IIWCV,0.00,N,
$IIWPL,4200.005,N,01925.540,W,001
$IIXTE,A,A,00.000,L,N
$IIBWC,,,,,,062.99,T,069.99,M,03.900,N,
$IIDBT,007.44,f,002.27,M,001.22,F
$IIGLL,4221.451,N,08257.210,W,011109,A
$IIHDM,103,M
$IIHDT,095,T
$IIMWD,047.77,T,054.77,M,06.10,N,03.14,M
$IIVDR,225.00,T,231.99,M,0.00,N
$IIVHW,093,T,100,M,00.00,N,00.00,K
$IIVPW,0.00,N,,
$IIVTG,293.94,T,300.94,M,0.00,N,,
$IIVWR,042,L,06.06,N,03.12,M,,
$IIVWT,042,L,06.04,N,03.11,M,,
$IIHDT,089,T
$IIWCV,0.00,N,

[Roman Malina]

Originally Posted by bdbcat

DetroitSail...

Hello again.

Can you post a screenshot of your screen with the NMEA data monitor window shown? We need to see an example of your GPS data stream.

You could also use Hyperterminal or other terminal program to look at COM1 without opencpn running.

I suspect there is a checksum problem with your NMEA data. Version 1.3.6 is fussy about this.....checksums are required for xxGLL sentences at least....

Dave

I have the same problem with Vista Garmin GPS connected to OpenCPN. Maybe the problem is with the NMEA format. Here is a screenshot of the data stream. Boat is not moved to current position and only turns by 45 degrees clockwise. Running simulation on GPS at speed 10 km/h.

Roman

[detroitsail]

Ok, I tried openCPN 2.1, build 514, and my GPS is recognized.
Thanks to all for the suggestions.

[Netsurfer]

Hi,

because it is the same problem I did not open a new thread for this.
On the German Website there is a guy who has the same problem, namely that his GPS does not show up in OCPN.

Here is his post (translated by me):
I am running OCPN 1.3.6.
I am using a Canadian GPS mouse which works fine with Stentec Win gps4, Yachtnavigator und NV - Navigator.
The GPS mouse is connected to a RS232 (it is not an USB) on COM 1.

Trying a Garmin GPS instead of my own everthing works fine.

Here are the NMEA sentences from both devices:

1. My GPS mouse
   $GPGGA,155747.77,5110.4943,N,00708.3215,E,0,03,4.1 ,376.0,M,47.6,M,,*6CII
   $GPGTG,138.7,T,,,0.8,N,1.4K*
2. Garmin GPS
   $PGRMM,WGS84*06II
   GPBOD
   RTE
   RMC
   RMB
   GGA,164341,,,,,0,00,,,M,,M,,*63II
   GSA
   GSV
   GSV
   GSV
   PGRME
   GPGMLL
   PGRMZ
   PGRMM,WGS84

Does anybody has an idea what could be the problem?
Or has experienced the same problem already?
Any tips or hints to solve the problem?

Many thanks in advance.

Gunther (asking for Peter Mühlhoff from the German Community)

[champ8242]

Gunther,

This could be the checksum problem solved in the latest build

Bart

[Netsurfer]

Bart,

Originally Posted by champ8242

This could be the checksum problem solved in the latest build

thanks for the tip, but still the same problem even with the latest build 518.

Any other ideas what he could try to get the GPS data into OCPN?

Gunther

[champ8242]

Gunther,

I just had a look at the parsed NMEA sentences in OpenCPN and the GGA sentence is not handled (yet). for a GPS position report you need a RMC or a GLL sentence.

Bart

[Netsurfer]

Bart,

thanks for your efforts - I forwarded the message.

Gunther

[champ8242]

Gunther,

I coded today the GGA sentence with a few of its parameters into OpenCPN, it's working on my side, no clue how to get it into the cvs. I even don't know if Dave wants it in the code? I can supply the exe this weekend somewhere for download as a test.

Bart

[Netsurfer]

Bart,

Originally Posted by champ8242

I can supply the exe this weekend somewhere for download as a test.

That would be great!
Or just mail it to me, please. Sent you my mail addy by PM.

Gunther

[Eclipse145]

Hello,

Thanks for the great software. I'm excited to use it but have been unable to get my GPS data recognized. I hope the original posters don't mind my using this thread for a similar problem.

I am seeing the NMEA data in the NMEA window, but nothing is happening in the chart view, as if it has no GPS connection. I am using an older Furuno GPS that does work with Capn Voyager on an older computer. I had to use a Serial to USB converter to plug that GPS into my newer computer with OpenCPN. I have tried ver 1.3.6 and 2.1.0 build 520 with the same results.

Here is a screen shot of my NMEA data:

Thank you for any assistance!

[janp391]

Boat icon not following the ship coarse
I have Raymarine instrumentation onboard. I take the GPS signal out from the autopilot. The autopilot convert SeaTalk to NMEA. The problem (also earlier described in another post) is that the NMEA sentenses from the autopilot give me all info that openCPN needs but not that the boat icon follow the ship coarse. If I use a GPS-USB all is ok.
The sentenses from the autopilot (Raymarine) is HDG,HDM,RSA, RMC,GLL and VTG. From the USB-GPS I will have GGA, GSA, GSV and RMC. I there anybody out there that use the same setup and have a solution that the Raymarine GPS can be used? Or is this something that has to be "fixed" in the openCPN?

[janp391]

I have 2 more nav programs, Fugawi and MaxSea both of them show the boat icon in the right direction with the NMEA information that comes from the autopilot.
To openCPN I have to have an USB-GPS for the input on one com port and the info to the autopilot on another com port. This instaed of in- and out- on the same com port.
As I understand this problem that the boat icon is not folllowing the ship coarse is inside the openCPN program??
My own skill is not enough to solve this problem so I hope for help.

[bdbcat]

janp391....

We need to see a screen shot like from Eclipse 145 (post #27).
That way we can see your NMEA data stream and discover the problem.

Thanks
Dave