I upgraded from my ST4000 Autohelm to a SPX-5 with P70 control head last summer. The main reason was the ST4000 was challenged holding a tight heading in bigger wave / higher wind days. Although suitable for my purposes it did not hold on course accurately either, which at the time I did not realize was an advantage ;-)
As a side note, the SPX-5 core pack does work with the original ST4000 fluxgate compass, rudder sensor and wheel drive. I did purchase the kit with new pieces but thought I would try the old stuff first before selling it so that I could claim it was working correctly and tested. Michael Brown Windburn C&C 30-1 Message: 3 Date: Thu, 16 Jan 2014 11:07:55 -0500 From: "Della Barba, Joe" <joe.della.ba...@ssa.gov> To: "cnc-list@cnc-list.com" <cnc-list@cnc-list.com> Subject: Re: Stus-List Setting GPS Waypoints (long) Message-ID: <1073606396712942aee54d9a960e45a718c9654...@hq-mb-07.ba.ad.ssa.gov> Content-Type: text/plain; charset="utf-8" This is a good discussion. This has been a big issue in the flying world too. Airplanes now are EXACTLY on the charted airway, not just within a few miles of it. This caused a head-on collision down in Brazil between a 737 and an Embraer jet. A lot of restricted airspace violations come from setting the destination waypoint and not bothering to look at what is between here and there. I like to use OpenCPN which allows very easy point-and-click setting of waypoints. I do not couple the autopilot. I like to stay in the loop and do the cross checking and corrections myself. One other thing to be way of ? especially on mapping GPSs with small screens, is a lot of things vanish when you zoom out. The entire crew of a boat in the race to Ensenada (iirc?) died when they plotted a course through an island and apparently they all fell asleep. Their tracker showed a ruler straight line right into the island that would have gone straight to the finish line. Joe Della Barba Coquina
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