Definition
A magnetic bearing extending outward from a VOR, VORTAC, or TACAN navigation station. Radials are numbered 001 through 360 and define a specific line of position from the station outward in any direction.
Plain English
A radial is one of 360 invisible lines that point outward from a ground navigation station like spokes on a wheel. Each line is named by its compass direction from the station.
Context Anchor
Pilots encounter radials in navigation, instrument flying, charted procedures, and air traffic control instructions such as intercepting or tracking a specific radial.
Derivation
From Latin 'radius' meaning 'spoke of a wheel' or 'ray.' The aviation meaning fits directly: each radial is a spoke radiating outward from the station at the hub.
Why Pilots Care
Radials provide the basic lines for VOR navigation, allowing pilots to fly precise tracks to or from stations for course guidance and approach procedures.
Analogy
Think of the navigation station as the hub of a wheel. Each radial is like a spoke pointing outward in a specific compass direction.
Intuition Check
Do not think of a radial as the direction you are flying. A radial is named for the direction from the station; if you fly toward the station along that radial, your heading may be roughly opposite the radial number.
Example Sentence 1
ATC instructed the pilot to intercept and track the 045 radial outbound from the VOR.
Example Sentence 2
ATC instructed us to intercept the 270 radial and proceed inbound to the station.