Ideally, the compass should be sited so that bearings of objects and other vessels may be taken. Time to buy a new compass? Note the new reading, remove the screwdriver, and then make sure the compass returns to its original heading. For small craft the more immediately relevant device is the solid state gyro, based on an electrically vibrated piezoelectric element also termed quartz or ceramic gyros. The International Standard ISO , which replaces most of the compass standards referred to by the NSCV, requires all magnetic compasses to be swung and adjusted no less often than every two years.
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Choosing a compass: Practicalities by Andrew Bray
On certain vessels, such as aircraft carriers, some fishing vessels and some modern container ships with a narrow superstructure section, the compass is offset, and this can create interesting challenges for compass adjusters. Note the new reading, remove the screwdriver, and then make sure the compass returns to its original heading. Not sure why you would need them all reading the same and getting everything to do this under every kind of condition is going to be next to impossible. Swinging a compass Handbook of Magnetic Compass Adjustment http: Posted by Bill Bishop - Parmain at 9: The Forum is a free service, and much like the "free" content on Public Radio, we hope you will support WoodenBoat by subscribing to this fabulous magazine.
The hard part is calculating the azimuth of the sun at the moment. This works even with a digital. Just steer the boat around, while one of you calls off the relative bearing to the landmark and the other calls off what your compass says. Swinging a compass Kevin is right. You get to decide what is close enough. Swinging a compass Handbook of Magnetic Compass Adjustment http: For what it's worth, I run Moonduster on "true" and rarely ever look at a compass.
Swinging a compass Don't need any of this swinging the compass stuff, you can get your direction by swinging your watch. Originally Posted by Hud3 Overkill? The compass is a key tool for determining the risk of collision Colregs rule 7. How does one find the URL. One needs to be anchored at a known point via GPS. Join Date Nov Posts 1,