Which of the following describes the height of the ERAA relative to obstacles?

The correct description of the height of the Emergency Route Alternate Altitude (ERAA) relative to obstacles is that it is typically set 1,000 feet above the highest obstacle within a given area. This altitude is crucial for ensuring that an aircraft can safely navigate through its flight path, providing a buffer against any uncharted obstacles that may be present.

By maintaining an altitude that is 1,000 feet above the highest obstacle, the ERAA helps to mitigate risks associated with unexpected terrain or obstacles, thereby enhancing the safety of the flight. This standard is designed to ensure that aircraft have sufficient clearance when operating in areas where obstacles exist, particularly when considering factors such as terrain variations and potential inaccuracies in obstacle data.

Other options may focus on flight plan data or average terrain, but these do not provide the necessary safety margin that the 1,000-foot clearance above the highest obstacle ensures. The choice that reflects this critical safety buffer is therefore the most appropriate for describing the height of the ERAA relative to obstacles.