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Great glad you got it working. Let me know if you get it talking to your plotter because i have never been able to get my Garmin to comm with the AP200DL.

Hi Capt Kangaroo, Hope I'm not to late to save you some frustration The wires match up with the exception of the Red from rfc250 and the green 2.5v ref both mate to the offset v/2 on the rc37. Hope that helps.

Thanks Capt, I will continue my research and look for your reply when you hook it up. My boat a GB32 is on the hard for the long winter but I did try the calibration by manual rotation but no luck. I love the AP200DL and hate to replace it. Rich has been very helpful and he did say it should...

Hi Capt, I too am in the process of adding an RC37 to my AP200DL to replace the failing RFC250. I wired today and connected but could not get a steady heading it just kept cycling from 45..180..270..000.. Any advice would be appreciated. I re-wired to SINE/COSINE per the drawing but noticed...