0 the direction, either east or west of the true north, in which a magnetized needle points. -- kim chỉ bắc
Mariners had observed that magnetic north deviated from geographic north in many locations.
Furthermore, the spikes can have either magnetic north or magnetic south facing up.
The phase difference corresponds to the actual bearing relative to magnetic north (in some cases true north) that the receiver is from the station.
Compass directions always have to be tied to a table of annual deflections because magnetic north is constantly changing.
A compass is any magnetically sensitive device capable of indicating the direction of the magnetic north of a planet's magnetosphere.
There are four steel pole tips, two opposing magnetic north poles and two opposing magnetic south poles.
Heading 360 corresponds to magnetic north, while headings 90, 180, and 270 correspond to magnetic east, south, and west, respectively.
In order to make them more compatible with systems that depend on magnetic north, magnetic north is often chosen, at the pilot's preference.
