Experts from REI do a great job of explaining the basic parts of a compass and how to use them, but here is the breakdown: Magnetic declination is the angle between magnetic north and true north ...

If magnetic north lies directly between you and true north, then you’ll have a declination of zero. But in most areas, you’ll have to add or subtract to what your compass reads as north.

This budget compass has most of the features of high-end models, including night navigation capability, clinometer, and adjustable declination. Trusted by the U.S. military for its durability and ...