We've got an antiquated Cetrek autopilot aboard our 50-foot, 40000 lb.
sailboat that's developing lots of interesting but not positive quirks
-- for example, it sometimes decides to turn hard left when the proper
course is straight ahead. The electronic part drives a hydraulic pump
that in turn drives a linear piston. My questions:

1. If we change brands, can we continue to use the hydraulic drive?
How about the fluxgate compass?

2. What brand is the best value for the money?

Rob