[CA] [CA11] ST60+, seatalk1, seatalk NG, ray55e, A70D and ST2000+

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Hi Chuck,
I am now considering adding a compass sensor to the system as you recommended earlier.
This will be the normal source of heading data but it will be disconnected when the ST 2000 autopilot is connected to the system (since my system cannot cope with multiple data sources).

Earlier in this post several you kindly provided suggestions for heading sensor as follows:
- EV-1 CCU,
- Airmar H2183,
- KVH AutoComp 1000,
- etc.

I have seen also seen some Raymarine flux gates avaialble second hand, including
- Fluxgate Compass Heading sensor Auto Pilot E12205
- Raymarine Autohelm 6000 Autopilot Fluxgate Compass
- Raymarine heading sensor E12198.

Could you please advise:
1. Are any of these second hand units would be suitable to provide heading data to my system?
2a. Are any of these units (including the units you suggested earlier) suitable for providing heading data directly to an NMEA connection (e.g. via one of my ST60+ Graphic displays) without the use of a separate instrument?
2b. If not, could you please suggest suitable sources of heading data that will not require a separate instrument to connect them in to my ST1 bus or ST NG network?

thanks
Dave