An old map and a compass

An old map and a compass

Historically, the magnetic compass was an important tool for navigation. So, how can you find the true north (geographic north) with a compass, since the location of North magnetic pole always changes? Detailed maps typically tell you how much local deviation there is between magnetic north and true north (magnetic declination). You then offset your compass by that many degrees, and you’re all good. These type of maps (for example, military maps) are get updated in every few years or so.

Image: PXHere

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