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On a backpacking trip, calibrate the altimeter only at the trailhead and at places, such as a pass or a lake, that are marked on a topo map. In your comment you mention maybe calibrating the altim...
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On a backpacking trip, calibrate the altimeter only at the trailhead and at places, such as a pass or a lake, that are marked on a topo map. In your comment you mention maybe calibrating the altim...