RADAR SERVICE- A term which encompasses one or more of the following services based on the use of radar which can be provided by a controller to a pilot of a radar identified aircraft.
a..Radar Monitoring- The radar flight‐following of aircraft, whose primary navigation is being performed by the pilot, to observe and note deviations from its authorized flight path, airway, or route. When being applied specifically to radar monitoring of instrument approaches; i.e., with precision approach radar (PAR) or radar monitoring of simultaneous ILS/MLS approaches, it includes advice and instructions whenever an aircraft nears or exceeds the prescribed PAR safety limit or simultaneous ILS/MLS no transgression zone.
(See ADDITIONAL SERVICES.)
(See TRAFFIC ADVISORIES.)
b.
Radar Navigational Guidance- Vectoring aircraft to provide course guidance.

c..
Radar Separation- Radar spacing of aircraft in accordance with established minima.

(See ICAO term RADAR SERVICE.)
RADAR SERVICE [ICAO]- Term used to indicate a service provided directly by means of radar.
a..
Monitoring-The use of radar for the purpose of providing aircraft with information and advice relative to significant deviations from nominal flight path.

b..
Separation- The separation used when aircraft position information is derived from radar sources.

RADAR SERVICE TERMINATED-Used by ATC to inform a pilot that he/she will no longer be provided any of the services that could be received while in radar contact. Radar service is automatically terminated, and the pilot is not advised in the following cases:
a..
An aircraft cancels its IFR flight plan, except within Class B airspace, Class C airspace, a TRSA, or where Basic Radar service is provided.