Our Simrad/Robertson AP300 has worked fine for four years. After launching this year we found its heading was way off. Rotating the RFC300 fluxgate compass
by hand barely changed the heading so I assumed the problem was the compass
tech support suggested an RC25 rate compass as a replacement.
Here's where it gets interesting. I installed the RC25, turned the autopilot
on and I had an accurate heading. After about five minutes, the control head
consistently issues a "Control Unit Failure" alarm
support had me do a master reset of the autopilot
and the control head
is now stuck in "Setup Required" mode and I can no longer get a heading. Contrary to the manual and RC25 instructions, there is no way to specify the compass type in either the user or installation
setup menus. I tried connecting the old RFC300 compass to see if I would be able to select the compass type but no dice. I swear I saw the compass type in the user setup menu before I switched compasses. The autopilot's rudder
angle feature still works properly so this appears to be compass related. I've checked all robnet connectors and even plugged the old compass back in with the new cable.
Simrad support now says I should find a technician at a dealer to troubleshoot. Anyone have experience with these autopilots or have any ideas for a solution? The RC25 compass was expensive and I'm not sure what to do next.