Connecting SeaTalk1 and NMEA2000 using the SeaTalk Converter

[JDGALE0070]

Sorry if this duplicates my post, but my computer screen blanked out and I'm not sure if it posted.....

My question is similar I think:

I have the ST4000+ currently interfaced to a ST50+ wind and ST50+ Tridata through one of its sealtalk ports. Also, I have its fluxgate compass connected. I want to add a third party (garmin gpsmap 942xs) NMEA 2000 MFD to provide GPS tracking.

I think I need the Raymarine seatalk to seatalkng converter kit (linking to the unused second seatalk port on the autohelm) and a seatalkng to NMEA 2000 converter cable to put the MFD into the converter.

First is this correct? Will the autohelm talke course tracking info over its seatalk interface?

Secondly, should the fluxgate compass be disconnected from the auto-helm?

Third, are there any other considerations to make this all work?

Thanks!