Can hikers use altimeters to estimate their descent rate?

Understanding Altimiter Readings

When using an altimeter, it’s essential to understand that the device provides a measurement of atmospheric pressure, which is then converted into an altitude reading. Altimeters can be adjusted to account for local conditions, such as differences in sea level pressure and temperature. However, for the purposes of estimating descent rate, these adjustments are typically not necessary.

Calculating Descent Rate

To estimate descent rate, hikers can use the following formula: (Change in Elevation / Time) x (60 minutes / 1 hour) = Descent Rate in Feet per Minute (FPM). For example, if the hiker drops 1,000 feet in 10 minutes, the descent rate would be (1,000 ft / 10 min) x (60 min / 1 hr) = 600 FPM. This calculation can be repeated at regular intervals to track changes in descent rate over time.

Interpreting Altimeter Data

When tracking descent rate, it’s crucial to pay attention to changes in altimeter readings over time. A consistent decrease in elevation indicates a steady descent rate, while sudden changes may indicate variations in terrain or other environmental factors. By monitoring these changes and applying the calculation above, hikers can gain a more accurate understanding of their descent rate and adjust their pace accordingly.