A magnetized needle that aligns with Earth's magnetic field at an angle, used to measure magnetic inclination.
From 'dip' (the angle at which magnetic field lines enter Earth) and 'needle' (a thin pointed object), created to describe the angled compass needle behavior.
A dip needle won't point north-south like a regular compass; instead it tilts up or down because Earth's magnetic field actually dips into the planet at different angles depending on where you stand.
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