Definition
The waypoint that marks the beginning of the initial approach segment on a GPS instrument approach procedure. It is the first fix at which an aircraft transitions from the en route or arrival phase into the approach itself, and from which the published initial approach course, altitude, and any required course reversal or procedure turn are flown.
Plain English
The point in space where a GPS approach officially begins. When the aircraft reaches this point, it stops being on the way to the airport and starts flying the approach.
Context Anchor
Seen on GPS instrument approach procedures and in the aircraft navigator when selecting or flying a GPS approach.
Derivation
Initial means first, from Latin initialis (beginning). Waypoint is a navigation term for a defined point in space identified by coordinates. Together: the first defined point of the approach.
Why Pilots Care
It establishes the entry point into the approach, ensuring correct sequencing and alignment before descending toward the runway.
Intuition Check
“Initial” does not just mean any early point you choose. Here it means a specific published waypoint that belongs to that instrument approach.
Example Sentence 1
After receiving approach clearance, the pilot confirmed the GPS was sequencing toward the IAWP and verified the published altitude for that segment.
Example Sentence 2
Before beginning the approach, the crew confirmed the IAWP was correctly loaded in the GPS.