Definition
A function in an RNAV or FMS navigation system that calculates and initiates a bank into the next leg of a flight plan before the aircraft reaches the upcoming fix, so that the turn rolls out cleanly on the new course rather than overshooting the fix and then correcting back.
Plain English
The navigation computer starts the turn a little early so the airplane smoothly joins the next course, instead of flying over the fix and then having to swing back onto course.
Context Anchor
Seen in RNAV, GPS, and flight management system discussions, especially when an instrument procedure changes direction at a fix.
Derivation
"Anticipation" comes from the Latin anticipare, meaning to take or act beforehand. Here it describes the system acting on the turn before the fix is reached, rather than waiting until the aircraft is on top of it.
Why Pilots Care
Ensures the aircraft stays within protected airspace during turns and reduces pilot workload in instrument conditions.
Grounding Statement
At an allowed fly-by fix, the system can guide the aircraft into the next leg with a smooth curve rather than a sharp corner.
Intuition Check
Do not assume “anticipation” means the pilot is free to cut the corner. Here it means the navigation system calculates an approved early turn where the procedure design allows it.
Example Sentence 1
As the aircraft approached the waypoint, the FMS used its turn anticipation feature to start the bank early, rolling out smoothly on the next leg.
Example Sentence 2
Pilots monitor the turn anticipation feature on the CDI to confirm the aircraft will capture the next leg without overshooting.