Definition
The first waypoint of an RNAV (area navigation) instrument approach procedure, marking the point where the initial approach segment begins. From the IAWP, the aircraft transitions from the en route or arrival phase into the structured approach to the runway.
Plain English
The starting point of an RNAV approach. It's the first fix the aircraft flies to when beginning the approach to land.
Context Anchor
Seen on instrument approach charts and in GPS flight plans for area navigation approaches.
Derivation
Initial means 'first.' Waypoint is a navigation term for a specific geographic point identified by coordinates, used in area navigation. So an Initial Approach Waypoint is simply the first navigation point of the approach.
Why Pilots Care
It marks the beginning of the approach segment, directly affecting navigation, altitude, and speed management from that point onward.
Intuition Check
Do not read IAWP as just any waypoint near the airport. It is a specific published waypoint used to start an initial part of the approach.
Example Sentence 1
After being cleared for the RNAV approach, the pilot flew direct to the IAWP and began the procedure.
Example Sentence 2
The GPS was programmed with the IAWP as the first fix in the approach sequence.