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Garmin GPSMAP NMEA to Standard Horizon VHF

Old 01-27-2024, 06:53 PM
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Default Garmin GPSMAP NMEA to Standard Horizon VHF

I purchased a Garmin GPS MAP 943 xsv. My Standard Horizon VHF NMEA 0183 wiring out of the unit is-

Blue MNEA GPS input (+)
Green NMEA DSC input (-)
Gray NMEA DSC output (+)
Brown NMEA DSC output (-)

My Garmin wiring is,

Blue NMEA TxA (out +)
Gray NMEA TxB (out -)
Brown NMEA RxA (in +)
Violet NMEA RxB (in -)

Tx transmit
Rx receive

Question is which wires goes where?
Thanks for your time.
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Old 01-27-2024, 07:28 PM
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Old 01-29-2024, 04:29 PM
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With NMEA 0183 input goes to output keeping + to + and - to -.

VHF........................................... Chartplotter
Blue MNEA GPS input (+) <--- Blue NMEA TxA (out +)

Green NMEA GPS input (-) <--- Gray NMEA TxB (out -)
Gray NMEA DSC output (+) ---> Brown NMEA RxA (in +)
Brown NMEA DSC output (-) ---> Violet NMEA RxB (in -)

---rick






Last edited by RickVicik; 01-29-2024 at 04:30 PM. Reason: It removed my spacing
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Old 01-29-2024, 09:12 PM
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Originally Posted by RickVicik
With NMEA 0183 input goes to output keeping + to + and - to -.

VHF........................................... Chartplotter
Blue MNEA GPS input (+) <--- Blue NMEA TxA (out +)

Green NMEA GPS input (-) <--- Gray NMEA TxB (out -)
Gray NMEA DSC output (+) ---> Brown NMEA RxA (in +)
Brown NMEA DSC output (-) ---> Violet NMEA RxB (in -)

---rick
Thank you Rick.
I guess Standard Horizon had a typeo. Had DSC instead of GPS. (-).
Since you're the man in I know. Explain to me this. I thought the GPS received and the DSC transmitted. I guess I looked at it backwards....
Dave
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Old 01-30-2024, 03:14 PM
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A NMEA 0183 connection is one-way from a single talker device to one or more listener devices. In your case, both devices talk and listen, so there is a connection for each direction.
According to the Garmin manual, your chartplotter can send and receive many different NMEA 0183 messages (autopilot control, depth, heading, GPS position, etc.), so the wire labels are just IN and OUT.
The VHF radio accepts only GPS position messages and sends only DSC messages, so the wire labels include "GPS" and "DSC".
According to the Garmin manual, you can enable or disable NMEA 0183 output messages. RMC should be sufficient for GPS position, but also sending GGA & GLL is probably OK.
Also, the data speed must be set the same on both sides of each NMEA 0183 connection using the setup options of the devices. It probably defaults to slow (4800) but you never know.

---rick
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Old 01-30-2024, 05:01 PM
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Once again thank you for the explanation. Yes, my Standard Horizon wants 4800 baud connections.
Evidently Garmin uses a proprietary language that is set to default. If I had a Garmin VHF, I'd be good to go. But I have to go into Garmin and set the communication settings so the Garmin can talk to the Standard Horizon.
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