Magnetic Field
In maritime context, a magnetic field refers to the area around a magnet or an electric current where magnetic forces can be detected. Magnetic fields are important in navigation as they affect the operation of compasses, which are used to determine direction at sea. The Earth also has a magnetic field, which is used by compasses to point towards the magnetic north. However, the Earth's magnetic field is not constant and can vary over time and location, which can affect the accuracy of compass readings. Therefore, it is important for mariners to be aware of the magnetic field and its effects on navigation.
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