What is the standard datum plane?

The standard datum plane serves as a reference point for pressure altitude, which is essential in aviation. This plane is based on the concept of standard atmospheric conditions, where the pressure is averaged to a specific value, typically 29.92 inches of mercury at sea level. Pilots and air traffic control use this standard for altitude measurements to ensure consistency and safety during flight. When aircraft report altitude in terms of pressure altitude, they are referencing this datum, allowing for effective communication and navigation in the airspace system.

The average sea level height does contribute to understanding atmospheric pressure, but it is not as precise a reference for altitude as the standard datum plane. The requirement for GPS above a certain altitude does not specifically relate to the standard datum plane. Lastly, while altimeter settings are related to weather, they are not the same as the standard datum plane, which is specifically about pressure altitude references. Thus, the relationship of the standard datum plane to pressure altitude makes this answer the most accurate choice.