4000+ a Plus
After having a 4000+ on a 28.5 and a 35.5 would have no problem making that recomendation. The integrated drive is very convient and seems to work well for this size boat. If you decide on this type, your biggest consideration will be the location of the control head. A lot of wires connect to this device, including power, compass, drive, seatalk (optional), nema (optional). It needs to be convient and within reach from your favorite helm seating position. You will find that you interface with the unit often when in use or just as a repeater to check the depth when someone is sitting in front of your depth guage. Performance wise, last Fall I made a nine mile run across the Chesapeake in heavy rain with minimul visibility. I put my home mark on the GPS, put the autopilot on track and never touched the wheel for an hour and a half. The furthest I was off track was .003nm, thats 180 ft.