Plain English Meaning

A spot on an airway that tells you when to stop using the VOR behind you for guidance and start using the VOR ahead.

Full Definition

A Changeover Point (COP) is a published location along a Victor or jet airway between two VOR navigation aids that tells a pilot where to switch navigation reference from the VOR behind the aircraft to the VOR ahead. COPs are normally placed at the midpoint between two VORs, but are relocated when terrain, signal interference, or airway geometry makes reception from one station unreliable past a different point. They are depicted on en route charts with a distance figure showing miles to each VOR.