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Three design changes that boats have undergone over time?
Are you calibrating an electronic compass?Or are you asking how to swing a magnetic onboard compass in order to work up a deviation card or graph?
Either way, keeping the boat tied to a dock is NOT the correct thing to do.
I can tell you exactly the steps to take to do for either, but your question needs to be a little more specific.
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Geoff
www.sailingunlimited.net
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Do it at the dock to assure that you are sttionary. Use the GPS to get direction. Do it again out on the water, later, with GPS.Where can i find information about a 1989 seaswirl boat?
What compass?Hand held?
Fluxgate toroidal electronic?
Binnacle compass?
Other steering compass?
Calibrating or swinging?
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What kind of boat are you using? Steel, aluminum, and FRP affect a boat's magnetic field different. You need to create a deviation card by running a know magnetic course at various angles. You will need an up-to-date chart showing most current magnetic variation for your area.Is it Legal to Drive a ATV on South Bass Island ( Put in Bay)?
get a recent edition of the local chart; figure out from it the local variation.Go out and run a number of different courses, covering as many directions from north to east to south to west as you can;
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run these courses between easily identifiable points...end of dock to middle of rock, buoy to buoy, top of hill ahead to middle of hill behind..do this with that new fangled GPS running; write down what the compass says, what the GPS says, and then measure off on the chart what the actual direction was; this will give you a table or graph of what corrections you need to apply for various courses in various directions... maybe say 5 degrees when running 045, maybe nothing when running 135
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Compass >Deviation>Magnetic>Variation>... or Compass course adjusted for Deviation ( what happens on the boat ) gives Magnetic, which adjusted for Variation gives True
Chapmans, Duttons, and Bowditch all have a step by step explanation on swinging a compass
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There are people that will calibrate your compass for you. It is fairly inexpensive and it is more accurate than if you do it yourself. There are small adjustment screws on the sides of the compass for the two axis, get a GPS or a local chart and adjust the screws to the chart, but it is not an easy task to do yourself and get it spot on.More Questions & Answers ...
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