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Old 12-08-2019, 01:00   #1
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Garmin gpsmap 172c - gps signal

I have opencpn v5.0 installed on a raspberry pi 3+.
Is it possible to get the gps signal from a garmin gpsmap 172c connected to a serial to usb hub (exsys USB to 4S Serial RS-232 ports) ?
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Old 12-08-2019, 03:45   #2
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Re: Garmin gpsmap 172c - gps signal

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Originally Posted by sindreh View Post
I have opencpn v5.0 installed on a raspberry pi 3+.

Is it possible to get the gps signal from a garmin gpsmap 172c connected to a serial to usb hub (exsys USB to 4S Serial RS-232 ports) ?
Yes, connect NMEA out + (blue) to pin 2, NMEA in + (brown) to pin 3 and connect NMEA gnd (black) to pin 5.
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Old 12-08-2019, 04:03   #3
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Re: Garmin gpsmap 172c - gps signal

Do I get the gps signal into opencpn by creating a new serial connection?
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Old 12-08-2019, 04:46   #4
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Re: Garmin gpsmap 172c - gps signal

Yes. I just had a chance to do this with Win10 and a serial to USB adapter:

Garmin 43CV NMEA0183 to USB
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Old 12-08-2019, 08:51   #5
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Re: Garmin gpsmap 172c - gps signal

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Originally Posted by sindreh View Post
Do I get the gps signal into opencpn by creating a new serial connection?
Yes, create the connection with baud rate 4800, 8 data, no parity, 1 stop bit. 4800:8,N,1

Use the NMEA debug window to see the NMEA messages. Using USB serial ports is not always simple because port numbers can change. OpenCPN should show you a list if available ports. The exact comm port number may require some trial and error which is why the NMEA debug window helps.
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