Overview

North is one of the four principal cardinal directions used to describe orientation on the Earth and in maps. It is a basic reference for navigation on land, at sea and in the air. For general background on the set of four points, see cardinal directions. Instruments that show north include magnetic and gyro compasses; for more on instruments see compass and related navigation tools. Many maps place north at the top; for map orientation conventions see maps.

True north and magnetic north

There are two common meanings of north. True (geographic) north is the direction along the Earth's surface toward the geographic North Pole. Magnetic north is the direction a magnetic compass needle points, toward the Earth's magnetic pole, which moves over time. The difference between them at a given place is called magnetic declination; navigators account for declination to convert compass headings to true bearings.

Historically, navigators used stars such as Polaris to locate north in the Northern Hemisphere, and used landmarks, wind patterns or coastal features when stars were not visible. Modern methods rely on a combination of satellite positioning (GPS), inertial systems and magnetic instruments. Surveyors and mapmakers establish reference meridians and use geodetic measurements to relate local north to global coordinates.

Maps and conventions

Map orientation has varied across cultures and eras. While most contemporary maps follow a north-up convention, other orientations have been used for cultural or practical reasons. The north-up choice is a convention that simplifies consistent presentation and helps align maps with compass bearings for navigation.

Examples and notable places

In everyday geographic terms, people commonly describe relative places using north: for example, the United States is north of Mexico, and Mexico lies north of Brazil. The farthest point on Earth in the northward direction is the geographic North Pole, a location of scientific interest, polar exploration and distinct environmental conditions.

Cultural and symbolic meanings

North often carries cultural associations: in many languages and traditions it is linked to cold climates, polar regions and the idea of the top or upper part of a page or screen. Terms such as "northward" are used in navigation and literature to indicate movement toward higher latitudes.

Practical considerations

Understanding north is important for accurate travel and mapping. When using a compass, correct for magnetic declination; when using a map, be aware of the map's reference system and projection. In aviation and marine contexts, headings and routes are routinely expressed relative to true north or magnetic north depending on regulations and instruments.

Quick facts

  • True north points to the geographic North Pole; magnetic north is the direction indicated by a compass and shifts over time.
  • Polaris has long helped northern-hemisphere navigators locate north before modern instruments were available.
  • Maps commonly use north at the top, but that is a convention rather than a rule.
  • Accurate orientation often requires converting between magnetic and true north using declination values.