True Variation Magnetic Deviation Compass

Magnetic declination or magnetic variation is the angle on the horizontal plane between magnetic north the direction the north end of a magnetized compass needle points corresponding to the direction of the earths magnetic field lines and true north the direction along a meridian towards the geographic north polethis angle varies depending on position on the earths surface and. Magnetic variation is due to the differing positions of the geographic north pole and the magnetic north pole. Tvmdc is a method for converting true magnetic and compass headings.
true variation magnetic deviation compass

Top True Variation Magnetic Deviation Compass, Tvmdc is a mnemonic initialism for true variation magnetic deviation compassthe most common use of the tvmdc method is correcting courses during nautical navigation.

True variation magnetic deviation compass. How to adjust a compass for magnetic declination or variation a compass does not point to the true north except by coincidence in some areas. Using examples this video also explains how to calculate the values. Magnetic declination changes over time and with location. Declination is positive east of true north and negative when west.

The compass needle is attracted by magnetic force produced in the outer liquid part of the earths core which varies in different parts of the world and is constantly changing. Magnetic declination sometimes called magnetic variation is the angle between magnetic north and true north. Compass bearing true bearing magnetic variation compass deviation. This video explains the concepts of variation deviation and compass error.

Compass readings deviations magnetic deviation. Discrepancy of magnetic and true poles magnetic declination. The boats compass and a hand bearing compass point to the magnetic pole but all bearings on charts are related to the geographic pole true north. To calculate the compass course by the true course or vice versa you should set the values of magnetic declination for given location and your compass deviation in the corresponding fields of the calculator.