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Stand at the backstay and take a bearing of the mast, while someone else checks the steering compass on a variety of headings. If you've got a large crew on board, you can carry out all of this at once: point the boat towards a variety of transits while checking both the hand bearing and steering compasses.
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Tie up your boat at the buoy and tie the dinghy to the stern. Use the dinghy's engine to point to each of the landmarks and compare the master compass reading with yours. Notate the deviation for each 30 - 45 degree increment. Recheck after compensation.
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Definitely keep the compass. In addition, always have paper charts of the areas you're boating or planning on boating. Don't rely upon or allow yourself to become dependent upon electronic devices. They are a wonderful convenience. They can allow a disaster if relied upon completely, though.
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The objective in compass adjusting is to neutralize the boat's magnetism, not to make the compass point in any particular direction. You can determine the effect of the boat's magnetic field on any compass bearing by simply turning the boat 180 for the amount that the compass overshoots or under‑shoots a 180′ change is always just.
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15 things you should consider when buying a compass for your boat. A compass ensures safe navigation. Courtesy Ritchie Navigation. A fair number of boats we test today don't have compasses, a shortcoming that many boaters consider a nautical no-no. A compass ensures safe navigation, even when a boat is equipped with a GPS.
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As the boat turns, the compass continues to point at magnetic north, and the course is shown (relative to magnetic north) in reference to a line, which represents the boat's heading. A compass has what is known as the "card," divided into 360 degrees. Thus, if the card reads 90 degrees, you will be steering a course due east; 180, due south.
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Compasses allow you to steer your boat on a magnetic heading and to take a magnetic bearing.. Magnetic or Electronic Compass. Magnetic compasses contain a free-spinning compass card, which aligns with the Earth's magnetic field and points in the direction of magnetic north.Small onboard magnetic fields, caused by ferrous metal (a steel steering wheel or iron engine block), magnets (a speaker.
Using Your Compass
A compass is maintenance-free. Just cleaning up. Clean your compass with soapy water. It is preferable to avoid solvents such as methylene, acetone or white-spirit, which are effective in the short term, but will strongly degrade the surface of the dome. If the liquid in the dome decreases, some models are equipped with a cap to make a top-up.
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Before you mount the compass onboard, it is recommended that you take the boat out on the water with the compass in hand. #1. While slowly heading North, try holding the compass up to different desirable points on the dash area of the boat and observe the compass. If you notice the compass change in direction without you steering the boat, then.
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As any new boat owner soon learns, the sport has a lingo all its own. But even old salts often have a hard time grasping the magnetic compass dialect. Ritchie Navigation explains two unusual but easily understood terms that are vitally important to the accuracy of a compass: Deviation and Compensation.
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Combined with an onwater procedure, a DIY boat owner can adjust a compass to provide a correct bearing. Alternatively, a qualified technician can complete the task. Both GPS-based and line-of-sight compensation methods exist , beginning with the compass installed but not locked into its final position.
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A compass and/or hand bearing compass: A compass tells you which direction your boat is heading in, north, south, east, or west, as measured in degrees relative to magnetic north. There are 360 degrees representing a full circle, with 0 degrees to the north, 180 degrees to the south, 90 degrees to the east, and 270 degrees to the west.
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A marine compass will have one set of magnets that is balanced to seek out magnetic north. Magnetic north is not true north — as in the North Pole — but the location of Earth's north polarization, near Greenland. The compass rose on nautical charts shows the difference, called variation, between true north and magnetic north for navigation.
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To check deviation all the way around the compass, approach your waypoint from several directions. You may need to use several waypoints to complete the circle. Some sailboats and a good many powerboats have two helm stations, each with a compass. Only one of these can be the master compass, so you have to designate one.
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Most sailboat compasses have an internal gimbal so the card will stay level when the boat is heeled. Powerboat compasses compensate in one of four ways. First, by using heavy dampening fluid. Second, by installing a weight under the card to slow its motion. The third, designed by Aqua Meter, relies on an air chamber to pivot the card, which.
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Since a compass points to magnetic north, it stands to reason that any ferrous metals near the compass will affect it. Put a couple of steel washers next to your compass, and you'll see it swing toward them. Put an 800-pound block of steel — your engine — in the vicinity, and you'll get the same effect. Even worse, magnetic compasses are.
