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Output GPS to DSC VHF
#1
Hi,

I have a RPi3-Sensehat setup with a USB GPS (see bragboard)

I'd now like to export GPS to my VHF radio (NAVMAN 7100EU)

Page 36 in the manual in the link above says the Navman has GPS/NMEA input (I know this since at the moment I have the VHF wired up to an old Garmin Etrex)

It also says Comm. Port: 4800 baud NMEA on page 36.

How could I do this, physically and in terms of software setup

Please  Smile

Leigh
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#2
look here

https://sailoog.gitbooks.io/openplotter-...erter.html
Angel  Entschuldigung für mein Englisch. Es ist "google english"
PN bitte auf german.  Big Grin
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#3
(12-01-2017, 03:57 PM)Luckbert Wrote: look here

https://sailoog.gitbooks.io/openplotter-...erter.html

Thanks Luckbert,
I put a notification request for when they come back in stock
I found the NMEA add documentation, with both a GPS and a gpsd example button - what is the difference?
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#4
Hi
Gpsd is a deamon. It is a small tool between GPS sensor and software.
GPS is the direct serial port.
Greetings Jürgen
Angel  Entschuldigung für mein Englisch. Es ist "google english"
PN bitte auf german.  Big Grin
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#5
Question 
OK,

so I have an NMEA 0183 to USB converter, but I'm not sure on the wiring.

The NAVMAN 7100 DSC VHF installation guide shows the following GPS connections:

'Yellow: NMEA IN (+) from GPS'
'Green: NMEA IN (-) from GPS'

The Etrex (that it is connected to the VHF at the moment) documentation says:

'White: Data Out' (and I have written a '+' on the page here, and this is connected to the yellow wire from the NAVMAN)
'Black: Ground' (and I have written a '-' on the page here, and this is connected to the green wire from the NAVMAN)

I can't remember how I worked out that about the Etrex connections, but it works

Now I want to replace the Etrex with the GPS out from the RPi Openplotter using the NMEA 0183 to USB converter.

How would I connect it up?

(a)
NAVMAN Yellow (+) to NMEA 0183 to USB converter R+
NAVMAN Green (-) to NMEA 0183 to USB converter R-

(b)
NAVMAN Yellow (+) to NMEA 0183 to USB converter T+
NAVMAN Green (-) to NMEA 0183 to USB converter T-

or (c ), something completely different?

And, out of interest, what is the difference between 'T' & 'R'?

After very short Googling, is T for 'Talker' (or simplistically 'Output') & R for 'Listener' (or simplistically 'Input')?
I found this which seems helpful, and since I have only one GPS output and one GPS input I can just connect as per (b) above?

Can anyone please confirm the connections I should make?
Thanks
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