A practical overview of outdoor watch sensors and their limitations.
Digital compass basics
A watch compass indicates direction when calibrated correctly. Nearby metal, magnets and electronic devices can interfere with its readings.
Understanding the altimeter
A barometric altimeter infers changes in elevation from changes in pressure. Weather changes can also affect its display. Recalibration against a known reference may improve readings.
Barometer and pressure trends
Air pressure can help users notice environmental changes, but a watch is not a standalone weather warning system.
Realistic outdoor use
Bring reliable navigation, check local conditions and follow appropriate safety practices rather than relying on a single wrist-worn sensor.
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Questions readers ask
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