Quick Answer
Calibrate your altimeter at your starting point, taking note of the exact elevation, and then recheck after descending at least 1,000 feet and ascending back to the same point.
Setting Up for Calibration
Before calibrating your altimeter, make sure to understand its type and any specific calibration requirements. For most electronic altimeters, this involves setting the initial elevation at your starting point. Consult your device’s user manual for specific instructions on how to enter this data.
Calibration Procedure
To accurately calibrate your altimeter, begin by standing at a known elevation point, ideally near a trailhead or at a landmark with a documented elevation. Take note of the elevation reading on your device. Next, descend at least 1,000 feet to ensure you’re below the starting point’s elevation, and then ascend back to the same starting point. Recheck your altimeter’s elevation reading at the starting point and compare it to the initial reading. If there’s a significant discrepancy, re-enter the starting elevation or adjust your device’s calibration as necessary.
Post-Calibration Verification
After calibration, it’s essential to verify the accuracy of your altimeter. Take note of any elevation markers or signs along the trail, and then use your device to measure the distance between these points. Compare your device’s readings to the actual elevation differences between these points. If your altimeter’s readings consistently deviate from actual elevations, recheck your calibration.
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