isogonic

Definition

An imaginary line connecting points on Earth where your compass points at the exact same wonky angle away from true north. Geographers and navigators love these lines because magnetic declination is messy, and apparently someone needed to map out all the places where compasses are equally confused. It's like a contour map for magnetic chaos.

Example Usage

The pilot checked the isogonic chart to determine the magnetic declination for the route across the Atlantic.

Source: Geographic and navigation terminology

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