How is "magnetic north" defined?

Magnetic north is defined as the direction to the north magnetic pole as indicated by a magnetic instrument. This is a crucial concept in navigation, as the magnetic compass points toward magnetic north, allowing users to determine their direction based on the Earth's magnetic field. Magnetic north varies from true north, which is the geographic North Pole, and understanding this distinction is essential for accurate navigation and map reading.

The other options do not accurately describe magnetic north. The strength of the Earth's magnetic field at different latitudes pertains more to magnetic field intensity rather than indicating a direction. While it is essential for navigation, defining magnetic north as a reference point for determining true north would overlook its specific connection to the magnetic pole itself. Lastly, framing magnetic north as a standard used in cartography misses the broader application of magnetic north being specifically linked to compass orientation and navigation rather than cartographic practices alone.