Commercial Pilot License (CPL) Practice Exam

True altitude refers to the vertical distance of the aircraft above sea level. This measurement is crucial for pilots as it provides a standardized reference point for altitude, which is independent of atmospheric pressure variations and local terrain. True altitude is often used in navigation and ensures that pilots maintain a safe distance above mountains or other obstructions, which is essential for flight safety.

The other options relate to various altitude measurements but do not accurately define true altitude. The altitude displayed in the cockpit can refer to indicated or pressure altitude. Weather deviations can affect the accuracy of pressure altitude readings and are more relevant to density altitude rather than true altitude. Height above ground level (AGL) measures the distance from the aircraft to the terrain directly below, which differs fundamentally from true altitude defined by sea level. Understanding the distinction between these various types of altitude is essential for pilots in ensuring safe and effective navigation.