Definition
In aviation navigation, the term north pole refers to one of two distinct points on Earth: the geographic north pole, which is the northern end of Earth's axis of rotation and the reference point for true north on charts; and the magnetic north pole, which is the point in the northern hemisphere where Earth's magnetic field lines point straight down, and which is the point a magnetic compass needle aligns toward. The two poles are not in the same place, and the angular difference between them at any given location is called magnetic variation.
Plain English
There are two 'north poles' that matter to pilots. One is the true north pole, the top of the Earth where all the lines of longitude meet on a chart. The other is the magnetic north pole, which is the spot the compass needle actually points to. They are in different places, so a compass and a chart will not always agree, and pilots correct for the difference.
Context Anchor
Seen when learning how a magnetic compass works and why it points toward magnetic north instead of true north.
Derivation
Pole' comes from the Greek polos, meaning 'axis' or 'pivot.' That fits both senses: the geographic north pole is literally the pivot point of Earth's rotation, and the magnetic north pole is the pivot point of Earth's magnetic field in the northern hemisphere.
Why Pilots Care
The offset from true north creates magnetic variation that pilots must correct to maintain accurate headings.
Grounding Statement
A compass needle is a small magnet, and its north-pointing end turns until it lines up with Earth’s magnet-like pull.
Intuition Check
Do not assume “north pole” always means the geographic top of the globe. In compass discussions, it usually means a magnetic reference, not just a place on a map.
Example Sentence 1
Because the magnetic north pole is not in the same place as the geographic north pole, the pilot applied the local variation to convert true course to magnetic course.
Example Sentence 2
During preflight planning the pilot applied variation to convert a true course into a magnetic heading that accounts for the north pole's location.