Definition
A point along the centerline of an airway or route segment where a pilot navigating by VOR is required to switch tuning and primary navigation reference from the station behind the aircraft to the station ahead. The COP is normally located at the midpoint between two facilities, but is published at a different location when terrain, signal reception, or route geometry require an unequal split.
Plain English
The spot on a route where you stop using the navigation station behind you and start using the one in front of you.
Context Anchor
Seen on instrument en route charts and in instrument procedure discussions, especially when flying between two navigation sources on the same route segment.
Derivation
Plainly named: the point where you change over from one station to the next. The term tells you exactly what to do at that location.
Why Pilots Care
Switching at the correct point keeps navigation signals strong and prevents loss of course guidance.
Grounding Statement
Picture flying between two marked points: the COP is the planned handoff point where your navigation reference changes from the one behind you to the one ahead.
Intuition Check
A change-over point is not a turn point or a place where the route itself changes. It is the point where the navigation reference changes.
Example Sentence 1
Approaching the COP, the pilot retuned the second VOR and centered the needle to track the next segment of the airway.
Example Sentence 2
The chart showed the COP halfway between the two VORs along the airway.