Oday 30 & Ranger 23
Join Date: Oct 2009
Location: Minneapolis, MN
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Airmar Weatherstation with Raymarine Wheelpilot
I've done two electronics installations using the Airmar PB150 Weatherstation and Raymarine Wheelpilots--one with an S1G Smartpilot (the one that came after yours, with separate computer and controller), and one with an ST3000 Autopilot, the one that preceded your ST4000+ MkII. Both were very successful, but neither tried to replace the Raymarine fluxgate with heading from the Airmar's internal compass.
The PB200 you propose has an even better compass than the PB150, but it is still at the top of a swinging and pitching mast. I would not recommend trying to replace the Raymarine compass with the Airmar signal. If you can afford over $1000 for the PB200, consider spending $100 more (street) for a new Raymarine fluxgate internal coil. Then use the Airmar compass (and GPS) for backup. Seatalk will prioritize the duplicate signals.
Your ST4000+ MkII controller will read NMEA 0183 wind direction and GPS sentences through its NMEA IN port, but will not read a compass heading sentence. If you want to introduce the Airmar compass heading to Seatalk, consider purchasing a Raymarine E85001 Interface box ($130 - street).
Hope this helps,