Swinging a compass with a gps
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Cost Of Compass Swinging
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Count on your compass
Page 1 of 2 1 2 Last Jump to page. Your GPS will not give your heading, only your track. Taking careful consideration of the tidal stream and leeway, I seem to recall being within a couple of miles or less on most occasions. This may be a dumb question but I've tried and failed to work out the steering compass deviation by using transit lines and hand bearing compasses so why can't I make comparison between the GPS heading and the compass heading and use that figure to produce a rough deviation card. Subscribe Get digital edition. This can then be repeated on as many points of the compass as you wish. Note if this chganges the deviation significantly and if it does repeat the whole process withg the new engine state. Your basic logic isn't flawed and you should be able to come up with a reasonable GPS based correction table for the deviation on the compass, but I would have to ask you why you need it so much. Thread Tools Show Printable Version. All you then need to do is to take bearings of the fore-and aft line of the boat from the same position that you were in for the first part of the exercise and compare the bearings with the main compass to draw up a deviation chart for the main compass. However, navigating in this traditional way certainly reminds you to 'aim off' and aim to be upwind of time and tide as you make you approach. Obviously, if the bearing changes choose somewhere else and try again but it's normally possible to find a place often up by the backstay which is deviation clear for the handbearing compass. Most boat's compasses are marked in 5 degree intervals in my experience. That's all the info you need to compile a deviation card. You might just steam past the bouy to check its position first or to log its position.
This may be a dumb question but I've tried and failed to work out the steering compass deviation by using transit lines and hand bearing.
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