To correct magnetic declination, you’ll need to know the declination information for your area. Usually, you’ll be able to find this on topographic maps. That said, ...

Understanding Declination: True North vs Magnetic North. The difference between True North (toward the North Pole, and usually the top of a map) and Magnetic North ...

If magnetic north lies directly between you and true north, then you’ll have a declination of zero. But in most areas, you’ll have to add or subtract to what your compass reads as north.

A recent pamphlet by D. L. Hazard (“Magnetic Declination in the United States, 1930” U.S. Dept. of Commerce, Coast and Geodetic Survey, Washington; Serial 540, 1932; ...

THE Meteorologische Zeitschrift for April contains an interesting article by Prof. G. Hellmann on the knowledge of the magnetic declination before the time of Christopher Columbus. Some years ago ...

Migratory birds can extract positional information from magnetic inclination and magnetic declination alone. Proceedings of the Royal Society B: Biological Sciences , 2024; 291 (2034) DOI: 10.1098 ...

Many migratory birds use Earth’s magnetic field as a compass, but some can also use information from that field to determine more or less where they are on a mental map. Eurasian reed warblers ...

Your navigation system just got a critical update, one that happens periodically because Earth’s magnetic north pole keeps moving. Here’s what to know.