True altitude is best described as the aircraft's height relative to

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Multiple Choice

True altitude is best described as the aircraft's height relative to

Explanation:
True altitude is the actual height of the aircraft above mean sea level. This reference is used for navigation, airspace rules, and flight planning, and it stays tied to sea level regardless of terrain or weather conditions. Height above terrain (ground level) varies with the landscape, and altitude relative to the air mass isn’t a standard baseline for aviation altitude. In practice, pilots set the altimeter to local QNH so the indicated altitude matches height above mean sea level under standard conditions.

True altitude is the actual height of the aircraft above mean sea level. This reference is used for navigation, airspace rules, and flight planning, and it stays tied to sea level regardless of terrain or weather conditions. Height above terrain (ground level) varies with the landscape, and altitude relative to the air mass isn’t a standard baseline for aviation altitude. In practice, pilots set the altimeter to local QNH so the indicated altitude matches height above mean sea level under standard conditions.

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