I am in the process of selecting an autopilot
for a boat with two hydraulic helms (on deck
and in the pilothouse). She's steel
and has a transom-hung rudder moved by a ram from a Marol rotary pump.
The two candidates left are Wil Hamm (W-H) and Comnav, both on the west coast
of North America. Mr. Hamm got back to me with a quote in 24 hours; I am still awaiting ComNav's reply.
Both are relatively no-frills units (the W-H unit is rather primitive-looking) and neither would be integrated with a GPS
but rather would steer to a heading from a fluxgate compass
. Both have a significant portion of their trade
with workboat and fishing
boat operators. I would suggest that you should think of your boat as more "commercial grade" and also poll
the type of sailors whose trips you wish to emulate and whose vessels resemble yours.
That gets you away from a lot of the more popular brands pretty quickly.