Definition
Position information expressed as a magnetic bearing outbound from a navigation station (the radial) combined with the distance from that station, typically in nautical miles. Together, the two values fix an aircraft's position relative to a single ground-based or area-navigation reference point.
Plain English
Where you are, described as a direction line out from a navigation station and how far along that line you are.
Context Anchor
Seen when entering, checking, or displaying waypoint positions in a flight management system.
Derivation
Radial comes from the Latin radius, meaning a spoke or ray extending out from a center. A radial is one of the 360 "spokes" running outward from a navigation station, each labeled by its magnetic direction. Pairing it with distance pins down a single point along that spoke.
Why Pilots Care
Radial and distance together give an unambiguous fix from a single station, which is why they appear in clearances, holding instructions, and FMS waypoint definitions. Misreading either value places the aircraft in the wrong location.
Grounding Statement
Picture a line drawn outward from a known point on the map; radial/distance information picks one exact spot on that line.
Intuition Check
Radial does not just mean “around” a station. In this context, it means a specific magnetic direction line extending outward from the selected station or fix.
Example Sentence 1
The controller cleared the flight to hold on the 045 radial at 20 miles from the VOR.
Example Sentence 2
When GPS signals were lost, the crew switched to radial/distance information to maintain accurate navigation.