What defines the MAP for a precision approach?

The MAP, or Missed Approach Point, for a precision approach is defined by the decision altitude specified for that approach, which is indicated by a barometric altimeter. This altitude represents the height at which a pilot must decide whether to continue the approach to landing or to execute a missed approach procedure if visual reference to the runway is not established.

In precision approaches, the use of barometric altitude is crucial, as it ensures that the aircraft is at the correct height above the runway for a safe landing or for executing a missed approach. This altitude is critical in aiding pilots to maintain a consistent and safe approach path. If the aircraft reaches this decision altitude and the runway environment is not in sight, the pilot must perform a missed approach.

The other options, while related to aviation and approaches, do not specifically define the MAP in the context of a precision approach. Runway visual range pertains to visibility conditions, ground speed calculations are important for overall situational awareness and performance but do not define the MAP itself, and a GPS position fix is crucial for navigation but does not serve the same purpose as the decision altitude in this context.