Definition
Under ICAO usage, a service provided by air traffic control using radar to identify aircraft and provide information on their position relative to other aircraft, terrain, or routing. It encompasses three specific functions: (1) Radar Monitoring — using radar to keep watch over an aircraft's progress along its flight path and warn of any significant deviation; (2) Radar Separation — applying radar-derived spacing standards to keep aircraft safely apart; and (3) Radar Identification — establishing positive correlation between a radar return on the controller's screen and a specific aircraft.
Plain English
When ICAO uses the phrase 'radar service,' it means any of three things controllers do with radar: watch your progress and warn you if you drift, keep you spaced from other aircraft, or confirm which radar blip is you.
Context Anchor
You may see this term in air traffic control procedures, especially when a controller identifies your aircraft on radar, gives headings, points out nearby traffic, or later says radar service is terminated.
Derivation
Radar comes from “radio detection and ranging,” meaning finding objects and their distance by using radio waves. Service means help or support being provided. Together, the term points to help from air traffic control that depends directly on radar information.
Why Pilots Care
Reduces pilot workload and improves safety by giving precise guidance and traffic information that would otherwise require visual scanning alone.
Intuition Check
Do not read “service” as a guarantee that air traffic control is handling everything for you. Here it means controller assistance based on radar information, within the rules and limits of that flight situation.
Example Sentence 1
After crossing the FIR boundary, the controller advised, 'Radar service terminated, resume own navigation,' meaning the previously provided radar functions had ended.
Example Sentence 2
While receiving radar service, the pilot was given traffic advisories for two aircraft at the same altitude.