Magnetic North

The direction towards the Earth’s magnetic north pole, where a compass needle points, which differs from true geographic north.

Magnetic North is the point on the Earth’s surface where its magnetic field points vertically downwards, and it is the direction that a magnetic compass will indicate. Unlike True North, which is a fixed point at the top of the Earth’s axis of rotation, Magnetic North is not static and shifts over time due to changes in the Earth’s magnetic field. This phenomenon is known as “magnetic variation” or “declination,” and the difference between Magnetic North and True North can vary depending on your location. Mariners must account for this variation when navigating, as relying solely on a compass without adjusting for the difference can lead to significant navigational errors, especially over long distances. Charts will often indicate the current magnetic variation for a specific area, and this information is essential for accurate course plotting. Additionally, the rate of movement of Magnetic North has increased in recent years, making it even more crucial for navigators to stay updated with the latest magnetic variation data. Understanding the distinction between Magnetic North and True North is fundamental in marine navigation to ensure safe and precise passage planning.