In navigation: The lodestone and the compass card …but is now called the variation or declination. For a time, compass makers in northern countries mounted the needle askew on the card so that the fleur-de-lis indicated true north when the needle pointed to magnetic north. This practice died out about 1700 because it succeeded only for short voyages… Read More
In magnetic compass The inaccuracy, known as variation (or declination), varies in magnitude from point to point on Earth. The deflection of a compass needle due to local magnetic influences is called deviation. Read More
magnetic survey
In magnetic survey …magnetic inclination, or dip, and declination (departure from geographic north) at several stations. If the object of the survey is to make a rapid reconnaissance of an area, a magnetic-intensity profile is made only over the target area. If the object of the survey is to delineate already discovered structures,… Read More
use by Columbus
In Christopher Columbus: The second and third voyages of Christopher Columbus …discovered the principle of compass variation (the variation at any point on the Earth’s surface between the direction to magnetic and geographic north), for which he made brilliant allowance on the journey from Margarita Island to Hispaniola on the later leg of this voyage, and he also observed, though misunderstood,… Read More
