AvNav implementation in OP2

[Littlechay]

Hmm - not completely clear what you want to achieve.
First of all it would be good to know what software you are running on your Pi3 and how the communication is running.
I guess you would like to have your data on the Pi4 in AvNav?

If you have it coming in to SignalK on the Pi4 as NMEA0183 it should go to AvNav out of the box.
Which openplotter-avnav and which avnav version you you have on the Pi4?

In AvNav on the status page you should see a connection to signalk (Socket Reader to localhost port 10110).
If you are on a real recent AvNav there is an edit button beside each connection where you can check the settings again.
If AvNav is seeing valid NMEA the status indicator on this connection should turn green.

The pi three is running raspian with signalK installed. 
I want to achieve NMEA data from two sources into the pi3 I then want that data sent over WiFi to the network then I want to see it on the Pi4 running openplotter. I can see the data in the signalK dash in openplotter but it doesn't show in AvNav. Which I would have thought it should given that openplotter is supposed to be configured to distribute the data received to all apps. 
Additionally I want the AIS data output to a UDP feed to vessel finder - but I can decipher that from the SignalK documentation.
I'm a marine electronics engineer and work with NMEA data everyday but this is the first time that I have tried to get SignalK working and am finding the dodgy documentation frustrating. 
I understand the status indicators on AvNav as I have it working with direct connections. Just can make it all work over the network.

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Small addition:
I guess you need to enable the SignalK to NMEA 0183 on the Pi4 (Openplotter).
For GPS RMC should be sufficient.
But I have no idea if there is a plugin that converts back SignalK AIS data to 0183.

But if you have the NMEA data available on your Pi3 it would be easy to configure an additional SocketReader in AvNav to get the data directly from the Pi3, port 10110. You yould even limit this to AIS data by setting up a filter there (assuming you route the position data via SK on Pi3->SK on Pi4->plugin->0183->AvNav).

Does SignalK output NMEA0183 on 10110 by default?
How do I add an additional output or change the port number?

Cheers

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Got it working. I was trying to read SK data on port 3000

Now to try and convert some useful charts. I tried to convert the free raster charts for NZ using the converter in Windows but it failed on a couple of files and then stopped processing the rest - any chance that there could be an option added to skip files with errors? Charts are available here https://www.linz.govt.nz/sea/charts/info...#nzmariner

LINZ NZ also has vector charts available for free that I use in OCPN. They are S63 format and require the usual user keys etc.. Is there anyway to read the charts already install for OCPN use? Perhaps a modification of the osenc plugin?

Thanks for the pointers
Chris