Bridges are full of rebar and will turn an autopilot quite a bit. So will sitting near the fluxgate with an iPhone on your belt with the magnetic closing latch holster.
Joe Della Barba Coquina C&C 35 MK I From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Jim Watts via CnC-List Sent: Sunday, November 02, 2014 11:42 PM To: Rick Brass; 1 CnC List Subject: Re: Stus-List Autopilot Gremlin - Caution! We have a few magnetic anomalies around here, I know not to put Otto in charge anywhere near them. Most are on the charts. Some are scary finding them. Jim Watts Paradigm Shift C&C 35 Mk III Victoria, BC On 2 November 2014 19:05, Rick Brass via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Good rule, Dennis. The bridge is, of course, iron and will alter the magnetic field seen by your compass to some greater or lesser extent, depending on the amount of iron and the proximity to your fluxgate compass. I was sitting next to the tiller pilot on my 25 one night, and had my car keys in my hip pocket. When I got up to look at a channel marker I was passing near, the boat changed course rapidly. Suddenly I was not just “close to” the mark, my standing rigging was tangled in it. It was a very expensive lesson in just how sensitive those little fluxgate compasses can be. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com<mailto:cnc-list-boun...@cnc-list.com>] On Behalf Of Dennis C. via CnC-List Sent: Sunday, November 02, 2014 9:25 PM To: CnClist Subject: Stus-List Autopilot Gremlin - Caution! Just a caution for those who regularly use an autosteerer. The Admiral and I were using the wheelpilot (Simrad WP30) as we passed under the Dauphin Island last weekend on our way to Pensacola. In the middle of the bridge, the wheelpilot went bonkers and steered hard to starboard. Luckily I was right there and disengaged it before we hit the fenders guarding the passage. No idea what caused it. Underground cables, gremlins, space aliens, etc.????? There was a line of overhead power cables but they were about a tenth of a mile behind us. All I know is new rule for the boat now. No autosteering through a bridge. Dennis C. Touche' 35-1 #83 Mandeville, LA _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com<mailto:CnC-List@cnc-list.com> To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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