Actually it worked reasonably well and in calm or mild water it was fairly well flawless. It was a Raymarine S1000 (no longer available) driven by my Lowrance LCX 37C chartpoltter. It did though have a couple short comings. My boat is a 27' shallow draft semi displacement hull. As a result of the hull design it tends to rock side to side from the wake of passing boats or just rough water. This rocking motion caused the GPS's indicated heading to swing from side to side even though the actual heading was virtually unchanged. That resulted in really working the autopilot as it tried to keep up with the perceived change. But this compounded the biggest problem for us. My boat is very quiet in the cabin and the hydraulic pump that came with the unit is extremely loud. It just drove my wife and I nuts! I believe the intended use of this particular unit was for open fishing boats less than 26' and in an open boat the sound level would most likely not be a problem. But for us it was. The new unit does tend to cycle a little when the hull is rocking but not nearly what the old one did. Also, the reduced action is evident as the compass driven GPS / autopilot heading is hardly moving from center as the hull is rocking. Also, the new pump even though mounted in the exact place the old one occupied is almost silent. My wife can hear it a little but I have to go down and get next to it - sometimes even touch it - to tell it is working. Much more pleasant at the helm. I did run into a problem with the install of the new unit. As mentioned the autopilot is a Raymarine EV-1000 and it comes and must it's own heading sensor the EV-1. I tend to like Lowrance plotters and also upgraded to a 9" HDS Gen 2 Touch unit and their 4G radar. My goal was to have the radar with MARPA functioning. Although the Raymarine heading sensor met all Lowrance's specs - NMEA 2000 compliant, 10 KHZ and such - it still would not work to provide a usable signal for MARPA. It worked fine for the the Lowrance GPS but not the Lowrance radar. Naturally, Lowrance blamed Raymarine and Raymarine blamed Lowrance and neither were willing to help diagnose the problem. The fix - spend another $600 on a Lowrance (actually Simrad) heading sensor. FRUSTRATING not to mention expensive but now everything tends to work but still trying to find a workable location for TWO heading sensors in a 27' hull with lots of electrical stuff already mounted! On 5/30/2015 12:16 PM, Phil Little wrote: > Ray, if I may ask, how well did the GPS autopilot work, compared to > the Raymarine? > > Did you switch because of performance issues? > > Thanks > > Phil Little > ------------------------------------------------------------------------ >