Short answer is yes. A bit more detail... The ST4000 works OK until the amplitude of waves gives us a "corkscrew" path upwind. I played with various setting, like damping, and added a rudder sensor. The ST4000 would steer but get out of cadence with the waves, then over or under correct. Not a big problem well off the wind or cruising, but I mainly race. Under spinnaker with a quartering sea I would be concerned about an accidental gybe.
The SPX-5 has an easy to adjust response setting. When set to responsive, upwind in 3' waves, 18 kts TWS it will hold a very tight course. Could set it for around 32 degrees AWA, think it would stray maybe +/- 2 degrees. I tried it downwind, hands on the wheel and ready to dis-engage the wheel drive, under spinnaker in 20 - 24 kts TWS. The SPX-5 kept a steady course even when the stern started to lift and surf. The longer answer is that when racing solo under more exciting conditions the ST4000 was not useful. The SPX-5 does a competent job and I trust it enough to go forward and change sails. Michael Brown Windburn C&C 30-1 PS: I can post more information about the installation and getting the Seatalk NG working with ST50 instruments on Seatalk 1 if anyone is interested. Date: Thu, 16 Jan 2014 14:52:33 -0500 From: Steve Sharkey <stevebshar...@gmail.com> To: "cnc-list@cnc-list.com" <cnc-list@cnc-list.com> Cc: "cnc-list@cnc-list.com" <cnc-list@cnc-list.com> Subject: Re: Stus-List Setting GPS Waypoints Message-ID: <adcaea32-518b-4c8b-a88b-0dc75dc78...@gmail.com> Content-Type: text/plain; charset="us-ascii" Are you seeing significantly better performance from the SPX-5 vs the ST4000? Steve Sharkey
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