How can pilots ensure accurate altitude readings in flight?

Calibrating the altimeter regularly is essential for ensuring accurate altitude readings during flight. The altimeter measures the atmospheric pressure to determine altitude; however, atmospheric pressure can change due to weather conditions and variations in air density. By calibrating the altimeter to the local altimeter setting, pilots adjust their readings based on the current atmospheric conditions. This not only provides the pilot with a correct altitude relative to sea level but also ensures safe vertical separation from other aircraft and terrain.

Maintaining a steady altitude, comparing with air traffic control, and observing other aircraft do not directly influence the accuracy of the altimeter readings themselves. While these actions contribute to overall flight safety and situational awareness, they do not address the calibration process necessary for precise altitude measurement. Regular calibration ensures that the altimeter reflects true altitude, accounting for any variations in atmospheric pressure.