OPENCPN to Navico 2kW Radar Processor

[moreton99]

Apologies if this is already discussed but I can find nothing on pre broadband radars and OPENCPN.
My boat has simrad labeled 2k radar going to a navico 2k radar processor. I am guessing this box converts the radar signal to NMEA for the simrad plotter.
I read that this radar setup can be used with newer simrad plotters using the ethernet port on the navico box so...
Does that mean I can use it with OPENCPN?

Some more detail.
When I looked inside the radar scanner is actually a JRC and it works straight to a JRC radar MFD without the navico box.

[nohal]

I highly doubt the actual radar data is transmitted over N2k at all due to it's low speed. Looking at https://ww2.simrad-yachting.com/Root...0Install_P.pdf it does seem it is transmitted over Ethernet. Whether the radar processor uses the same protocol as the 3G/4G broadband radars is unknown, but pretty easy to tell in case you are able to turn the radar on and record the traffic using Wireshark on a computer, in which case it can be compared with what is known about the broadband units.

[moreton99]

I have to make up a cable to go from the processor to the scanner because I think my cable is suspect and its hard to test up a mast. But here is what I get with no scanner connected. prob useless but i do appreciate the advice and wanted to respond.

is this what you would expect or am i using wireshark wrongly?

Frame 1: 606 bytes on wire (4848 bits), 606 bytes captured (4848 bits) on interface 0
Ethernet II, Src: NamanNz_00:58:15 (00:0c:a5:00:58:15), Dst: IPv4mcast_06:07:09 (01:00:5e:06:07:09)
Internet Protocol Version 4, Src: 169.254.80.38, Dst: 236.6.7.9
User Datagram Protocol, Src Port: 3003, Dst Port: 6679
Data (564 bytes)
Data: 05c400000000000000000000fa000000fa00000007f60400.. .
[Length: 564]

[nohal]

Yes, I would expect to se UDP packets similar to this. You may compare what you see with the samples from https://github.com/opencpn-radar-pi/...master/example to evaluate the chances you have.

[moreton99]

No Joy,

Open CPN detects the radar ip but cant see any nmea.

Looked at the example you linked me to and there are large packets in the example yet I am not seeing any big packets in my stream in wireshark.

Might be a problem in the radar processor.

Thanks for the help.

[Neptune's Gear]

I'm not aware of any Navico radar called a 2K. Do you mean a 2KW?
The Opencpn plugin is for the broadband radars, the Br24, 3g and 4G units.
The older units are completely different, internally and processing..

[moreton99]

Yes sorry it's a 2kw. Seeing the processor can talk to newer mfd's via Ethernet I thought it was worth a try. Was partially using opencpn to diagnose the radar. As the processor had an Ethernet port and appeared to be sending data to the pc, if there was nmea packets it would have been helpful.

[Hakan]

moreton99
What you should look for is not sent by the NMEA protocol. It's an own protocol for each radar type. If you want to study more this link is to the base document for creation of the BR24radar_pi data protocol.

http://www.roboat.at/fileadmin/user_...kiEtAl2011.pdf


Håkan