The Earth’s magnetic north pole is shifting at an unprecedented speed, forcing researchers to make early updates to World Magnetic Model that helps navigation by ships, planes and submarines in the Arctic. Magnetic north did not move significantly between 1900 and 1980, but it has accelerated in the last 40 years. It’s now moving at about 50 km (30 miles) a year, causing the US military to request an update to the model that was originally planned for 2020. The moving pole affected navigation, mainly in the Arctic Ocean north of Canada. NATO and the US and British militaries are among those using the magnetic model, as well as civilians.