If your compass features an adjustable declination, start by finding your declination value, the deviation between magnetic ...

How to Find Your Location with a Compass. ... After adjusting your compass for declination, start by orienting your map to true north, as in the previous example. 1.

Your compass may be about to point 'true north' for first time in 360 years ... Experts say the line of zero declination is moving westward at a rate of around 12 miles (20km) per year.