Navigating Earth's Magnetic Field with a Compass

A compass is a simple device that uses a lightweight magnet to align with Earth's magnetic field, pointing towards the magnetic North Pole. However, the magnetic North is not the same as the geographic North Pole, leading to a discrepancy known as declination. This varies by location due to the non-uniformity of Earth's magnetic field. Additionally, the magnetic North Pole is not fixed and has shifted significantly over the past century. Despite these challenges, navigators can adjust for declination using charts and local calibration to ensure accurate navigation.

Describe the changes in the magnetic North Pole over the last century.

How can compass users compensate for the differences caused by declination?