Navman DSC wiring

[tritonofnor]

Got a Navman7100, and a Garmin72 GPS. Bought the Garmin power/data lead. Ran a lead to power both from the switch panel. got both to power up. joined the Garmin NMEA out to Navman NMEA in, and the Navman NMEA negative to the common ground powering both units as per Navman instructions. Result - no gps info at the radio. Anyone got any idea where I've gone wrong?

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[rhc21]

I have connected mine to a Magellan with no problems. Are you sure that the 7100's setting are set to take the GPS data in the menus and is not set to manual or simulator?
Not sure if this could cause the problem, ignore this post if you've already checked all of those!!

Richard


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[simonfraser]

the output from the GPS may have to be reprogrammed

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[philip_stevens]

Have you had a VHF-GPS-Interface supplement sheet with your installation instruction manual?

If not, let me know (via a PM with your email address), and I will email a copy of it to you. It appears there may be some confusion with the original manual diagrams.

This is the header of the supplement -
"For interfacing Navman Trackers or other brands of GPS to the VHF7100 or 7200 models please connect using the following schematics. Page 1 is a general guide for other brands Page 2 is for connecting Navman Trackers to Navman VHF.
<font color=red>The connection labelling on the VHF cable or in the manual may be incorrect.</font color=red>"

<hr width=100% size=1>regards,
Philip

 

[stretch33]

I've just got a tracker and a 7100 VHF and mines not working together..........................Yet !

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[oldharry]

My Navman works fine with my old Garmin 12 (knew there was a good reason to hang on to it when I upgraded!), Check the Garmins NMEA set up, as mine did not work to start with until the Garmins NMEA output had been set to NMEA/NMEA . Also the NMEA return line on the 12 was 'floating' - i.e.not connected to the GPS power negative line, and both sides of the NMEA cable had to be connected to complete the data circuit, not via the power negative feed line. The 4 pin plug (on the 12) separates the power supply completely from the NMEA output, and both NMEA pins on the GPS have to be connected. I would assume the same applies to other Garmin models.

The Navman book is on the boat, but I did not have to do anything to the set for it to read the Garmin output as far as remember

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[tritonofnor]

Thanks all - most helpful. Seems there is a dodgy batch of radios about at the moment- local chandlery are going to swap it for another.

<hr width=100% size=1>Marina skips - the greatest free resource centre!

 

[JohnGr]

Nearly all GPS's and chartplotters do not output NMEA until you have enabled it in there set up menu's. Also the nmea out from Garmin is referenced to the -ve supply lead. So the radio nmea+ goes to garmin blue and the nmea -ve goes to garmin black. Don't forget to set up the nmea in the interface or input/output menu.

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[georg]

Seems that I've just the same problem as you. It wasn't possible to let the navman get valid data from the Garmin72. Some simple measurements were showing a seemingly correct installation of the electrics.
Now I did a comparison of the protocols of Garmin72 and Garmin12. Further I compared it against the NMEA norm.
The result is: the Garmin72's protocol is illformed. The Garmin72 appends one more field to its records indicating to be working at normal or simulation mode.

The two sentences needed by the Navman are defined as follows:

GLL - Geographic position, Latitude and Longitude
GLL,4916.45,N,12311.12,W,225444,A
4916.46,N Latitude 49 deg. 16.45 min. North
12311.12,W Longitude 123 deg. 11.12 min. West
225444 Fix taken at 22:54:44 UTC
A Data valid

RMC - Recommended minimum specific GPS/Transit data
RMC,225446,A,4916.45,N,12311.12,W,000.5,054.7,191194,020.3,E*68
225446 Time of fix 22:54:46 UTC
A Navigation receiver warning A = OK, V = warning
4916.45,N Latitude 49 deg. 16.45 min North
12311.12,W Longitude 123 deg. 11.12 min West
000.5 Speed over ground, Knots
054.7 Course Made Good, True
191194 Date of fix 19 November 1994
020.3,E Magnetic variation 20.3 deg East
*68 mandatory checksum

The Garmin12 does them correct:
$GPGLL,3807.219,N,01506.721,E,153801,A*24
$GPRMC,153803,A,3807.219,N,01506.721,E,000.0,360.0,050105,001.6,E*79

The Garmin72 appends 'N' or 'S':
$GPGLL,3826.6764,N,01554.4107,E,153316,V,S*4A
$GPRMC,153318,V,3826.6764,N,01554.4107,E,0.0,0.0,050105,2.2,E,S*19

Because I'm willing to use my combination Navman-Garmin72, I will try find some work around or update from Garmin.