I have had some problems with my Raymarine
C80 system with an older S1 Autopilot Computer and ST8001 controller. I'll give you my findings in case they help.
First, occasionally when I broadcast on SSB my autopilot controller locks up. I just reboot the system and go on. I suppose I should look at the cable pathways, shielding, and my SSB ground plane. But that's kind of low on my list of things to do.
Recently I lost
signal at the chartplotter (helm) and on my autopilot controller so I've been tracing down the whole system and looking for issues. It was installed by the PO.
My autopilot computer was not grounded, though the manual says it must be grounded. I grounded it to ships ground. I was afraid to ground to my SSB ground plane because I am afraid that when transmitting there might be a lot of RF. I didn't want the potential problem.
With that and tightening up some seatalk
connections I had the chartplotter working but the autopilot controller was still saying "No Pilot".
In all of my testing, etc. I found that if I disconnect the fluxgate compass I get the no heading alarm but the chartplotter shows a round dot where the ship is. Instead of the boat shaped icon.
Then, tracing down the seatalk
cabling I found that there was a "terminal block" behind one of my lockers where the seatalk data wire (yellow) had broken loose and was just kind of touching the block. Also, at the same block, the ground for the DC power cable from my breaker panel was off. Since the seatalk ground was still good, the instruments were still working but I wonder if there weren't some kinds of ground loops that might have affected the data integrity.
I've run some new cables
, changed cable paths and tried to generally clean things up. Hopefully, I'll get it finished today and will be able to do a dockside test. It'll be a week or so before I get to sea test it and I suppose I'll have to recalibrate everything at that point. Just to be safe.
So, I'd suggest that you recheck all cables
. There could be a bad splice somewhere. It sounds like your course computer power. The fluxgate signal gets to your chartplotter via the computer (I think).
Also, you might email
the Raymarine technical help. I've found them to be very helpful and responsive.