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📘 How does a compass find north?

Look at a compass on a table: its needle swings, slows, and settles into one direction. It is not spotting an Arctic destination; it is aligning with the horizontal part of Earth's magnetic field right where you stand.

3
lessons
~15 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. A needle follows a fieldExplain how a compass responds to Earth's local magnetic field and distinguish it from true north.A compass follows the horizontal magnetic field, not a line aimed directly at the geographic pole.
  2. Declination makes the differenceDefine magnetic declination and use it to connect map bearings with compass bearings.Declination is the place- and date-dependent angle between magnetic and true north.
  3. The pole wandersDescribe why magnetic north changes position and why field models update declination.Moving outer-core metal changes the field, so the magnetic pole and local compass direction drift.

Questions this course answers

What does a level compass needle align with?

A compass responds to the local magnetic field, especially its horizontal component.

Why can a map bearing and a compass bearing differ?

The references are different even when both are labeled north.

What is magnetic declination?

Declination is the location- and time-dependent angle between the two north references.

Put the navigation checks in a sensible order.

You need the reference and current correction before adjusting and checking the instrument.

Why does magnetic declination change over time?

The field evolves, so its local direction and the magnetic pole position evolve too.

Why is the magnetic north pole not the same as true north?

The rotation axis and the irregular magnetic field are different reference systems.

Grounded in trusted sources

  • NOAA National Centers for Environmental Information, Magnetic Declination, https://www.ncei.noaa.gov/products/magnetic-declination
  • NOAA National Centers for Environmental Information, Tracking Changes in Earth's Magnetic Poles, https://www.ncei.noaa.gov/news/tracking-changes-earth-magnetic-poles
  • NOAA NCEI, Geomagnetism Frequently Asked Questions, https://www.ncei.noaa.gov/products/geomagnetism-frequently-asked-questions
  • U.S. Geological Survey, What do the different north arrows on a USGS topographic map mean?, https://www.usgs.gov/faqs/what-do-different-north-arrows-a-usgs-topographic-map-mean
  • U.S. Geological Survey, How Should I Set My GPS and Compass?, https://www.usgs.gov/educational-resources/how-should-i-set-my-gps-and-compass
  • Wikimedia Commons MediaWiki API, image metadata and thumbnails, https://commons.wikimedia.org/w/api.php

Every Wunder lesson is built from real, reputable sources — never invented.

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