On our new-to-us 2000 PSC37 Voyager, we have the B&G Network Pilot. Can't speak very well to some of your other questions as we only had her for 3 months last season.
But the unit drives a substantial RAM that connects to a 2nd tiller arm mounted on the rudder post. Previous owner told me his only disappointment w/the unit was the battery draw being more than he would have liked. The owner's manuals etc are posted in the SUPPORT section of the B&G website