What is a barometric altimeter?

posted this on 3 Feb 2017

A barometric altimeter, used along with a topographic map, can help to verify one's location. It is more reliable, and often more accurate, than a GPS receiver for measuring altitude. Because barometric pressure changes with the weather, hikers must periodically recalibrate their altimeters when they reach a known altitude, such as a trail junction or peak marked on a topographical map. When calibrated the Barometric Altimeter will be accurate to 1 metre.

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