The built-in digital compass works by detecting a magnetic direction. Do not rely solely on the location information the built-in digital compass provides.
Especially at the following locations, the accuracy of the digital compass can be easily affected by magnetic interference and it may not work correctly.
Inside an elevator or a room built with ferrous materials, such as iron frames or reinforced concrete
Near a reinforced concrete structure, such as a footbridge or an airport or a train station concourse
Near or inside a train or a car
Near a transformer on the ground or high-voltage power lines
Near a metallic product, such as a metal frame desk or metallic furniture
Near a material that has a high level of magnetic interference, such as a magnet, a magnetic holder, or speakers
Calibrating the built-in digital compass may correct the direction. See Notes on Built-In Sensors for more information.