The OP states that the Raymarine AP is not visible on the network as a device. I suspect that the Raymarine Seatalk NG connection may be an issue. Raymarine requires an adapter to interconnect to a "standard" NMEA 2000 backbone and they do not sell one except in certain situations and equipment
purchases. My solution was to "splice" a segment of Seatalk NG backbone onto my Garmin
Backbone allowing both types of "T" adapters to be used on my system.
I made up one to connect a short Raymarine Seatalk NG backbone segment with a Regular 2000 backbone plug
. This allowed the Raymarine NG to connect directly to the other backbone. Raymarine connectors are not the same so a dropcable from say a Garmin or Simrad version of NMEA 2000 wont plug
in to the Ray network either.
I think I bought the extra Male or Female connector from Airmar or one from Raymarine and the other from Garmin I don't remember. Strip one back and wire it to the corresponding wire one the other system and plug the two backbones together. Then need a Raymarine "T" for it's dropcable and their Terminator on the NG end.