How close does the altimeter need to be set in relation to field elevation?

The correct answer is based on the operational requirements for altimeter accuracy when flying, particularly in relation to field elevation. The altimeter needs to be set within a specific range to ensure that altitude readings are accurate enough for safe flight operations, especially during takeoff and landing phases.

An altimeter setting that is too far from actual field elevation can result in significant discrepancies in altitude, which could affect the aircraft's safety. The standard for altimeter settings in relation to field elevation is that the altimeter should be set within 75 feet of the actual field elevation. This is crucial for pilots to maintain altitude awareness and prevent terrain collisions, especially in areas of high or variable terrain.

Setting the altimeter to within this range allows for a margin of safety and ensures compliance with aviation standards. Other options, while they may seem plausible, do not align with the established safety guidelines for altimeter settings. By adhering to the 75-foot standard, pilots can ensure that their altitude readings are reliable, contributing to safer navigation and operation of the aircraft.