OpenMarine

I'd like to use an existing controller board I have to integrate NMEA 2000. Is there a spec for the communication to the MacArthur HAT?

MacArthur HAT communicates by SPI using a MCP2518FD chip. There is a driver for this chip in Raspberry OS.

this could be a good point to start:

https://microchip.my.site.com/s/article/...le-project

Ok, I see from the schematic it's just routing to pins 10-13. SPI that's easy. Thanks