Garmin Radar

[JeffreyAC77]

On our Garmin 7215, the radar option is lost (worked previously). I am wondering if this could be a fuse or possibly a breaker?? If a breaker - where would it be located on our 2015 R31-CB (LE)?

TIA.

 

[glider4]

I’d first check the connection at the base of the radar dome. There’s a known problem with the original connector coming loose.

 

[JeffreyAC77]

Will do - thanks.

 

[Dcsqatar]

Always a chance that there is a loose connection on the NEMA2000 backbone.

 

[JeffreyAC77]

Where is this "backbone" located? I am not familiar with the terminology.

 

[Bruce Moore]

Technical reference for Garmin NMEA products.

 

[Dcsqatar]

The "backbone" is the series of plastic "T" connectors (one for each NEMA communicating device like Chartplotter, radar, GPS, VHF, etc.) to which a cable from each device is connected. The T connectors are connected via threaded plastic connections. On my 29S the backbone was mounted on a bulkhead accessible from a removable panel in the front of the cave (lower berth). It took two years of frustrating Garmin device performance (in my case the AIS) to determine that the cause was insufficient stability in the backbone as it was mounted by just two screws. It would bend with boat motion resulting in one or more loose connections. The fix was to mount the backbone on a piece of wood, via a screw attached to each "T", and then mounting the backbone assembly to the bulkhead.

 

[SJI Sailor]

A simple upgrade here helps with the backbone stability while making additional room by being more compact: replace individual Ts with a multiport backbone: https://www.garmin.com/en-US/p/588702.

 

[Gin]

On my R31, the NMEA backbone can be reached (not necessarily easily) by crawling as best you can into the cabinet under the TV in the master berth. The backbone is mounted to the inside of the hull just aft of that cabinet area. You should expect at least six to eight connections on the backbone — possibly more. The backbone is probably a good two feet or more long. If I recall correctly, on my boat, the radar is the farthest aft. So it’s the most difficult one to reach from inside that cabinet.

Another possible way to get to the connections, especially those on the aft end of the backbone, would be to pull the refrigerator. There is enough space behind and under the refrigerator for a person to basically climb into the space under the helm seat, which should provide some access to the backbone — especially the connections on the aft end of it.

Hope that helps.

Gini

Additional note: SJI Sailor posted his reply about the time I posted mine. The multiport backbone he linked to looks like a worthy upgrade. If I have reason to have to get access to the full backbone, I’ll think seriously about upgrading using the multiport option for the sake of having better connectivity that would minimize the need to have to get to the backbone.

 

[Submariner]

RADAR uses a Garmin Marine Network connection, not a NEMA2k connection.
The marine network is ethernet.

The GPSMAP 7215 uses NEMA 0183 ports (4 of them) and has (3) Garmin Marine Network ports.

https://www.garmin.com/en-US/p/28128#specs

RADAR moves too much data for NEMA 0183 (or NEMA2k for that matter).

I would disconnect/reconnect the marine network connection of the RADAR on the back of the chartplotter to see if that solves it. The RADAR also is supplied power via a separate cable that carries 12volt only. Check the fuse and check the connections at the RADAR itself.

Here's an illustration of how a Garmin Marine Network, and N2k integrate on an 8612 chartplotter. Just as an example as the newer gear supports J1939 and Nema2k.

https://www.letsgochannelsurfing.com/_files/ugd/b6c9c0_85ed9b5348034e1bb49f441d5bba5227.pdf

 

[Fishmagnet]

There is an option to turn off radar on a chart display. This happened to me on a foggy morning leaving Prince Rupert. I thought our radar had quit working but it was just an option that had gotten turned off.

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