Definition
A waypoint on an RNAV (area navigation) instrument approach that serves a dual role: it is both the Initial Approach Waypoint, marking the point where the initial segment of the approach begins, and the Intermediate Fix, marking the point where the intermediate segment begins. It is used on approach designs that do not require a separate initial approach segment, allowing the aircraft to join the approach directly at this point and proceed inbound.
Plain English
A single point on an instrument approach that does the job of two — it is where the approach starts and also where the middle part of the approach begins. The pilot can join the approach here and fly straight toward the runway from this point.
Context Anchor
Seen on instrument approach charts and in panel navigators during instrument approaches, especially approaches built from named waypoints rather than ground-based radio stations.
Derivation
“Intermediate” means between two parts. “Initial” means first. “Fix” in navigation means a known position, not a repair. “Waypoint” means a point used to guide travel along a route. Together, the term describes a known point that connects parts of an approach path.
Why Pilots Care
Proper identification of this point ensures correct altitude, speed, and course alignment for a stable final approach.
Intuition Check
Do not read “fix” as something being repaired. Here, a fix is a known position, and this term names a position used to organize the approach.
Example Sentence 1
Center cleared us direct to the IF/IAWP for the RNAV 27 approach, so we joined the approach there and continued inbound without flying a procedure turn.
Example Sentence 2
Pilots must be established on the final approach course by the initial approach waypoint.