Magnetic deviation, also known as compass deviation, is the error in a magnetic compass reading caused by local magnetic fields interfering with the Earth's magnetic field. This deviation occurs when there are ferromagnetic materials or electromagnetic fields nearby, which can distort the compass needle's alignment with the Earth's magnetic field. Deviation can happen due to various factors, including: 1. **Metal Structures**: Large metal objects, such as ships' hulls or buildings, can create magnetic fields that affect compass readings.
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