(2)
RADAR NAVIGATION GUIDANCE - Vectoring aircraft to provide course guidance.

(3)
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 Instrument Landing System/Microwave Landing System approaches, it includes advice and instructions whenever an aircraft nears or exceeds the prescribed PAR safety limit or simultaneous Instrument Landing System/Microwave Landing System no transgression zone. (See Additional Service, Traffic Advisories)

RADAR SEPARATION (ICAO) - The separation used when aircraft position information is derived from radar sources.
RADAR SERVICE (ICAO) - Term used to indicate a service provided directly by means of radar.
RADAR SERVICE TERMINATED - Used by Air Traffic Control to inform a pilot that he 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:
(1)
An aircraft cancels its IFR flight plan, except within a Terminal Control Area, Terminal Radar Service Area, Airport Radar Service Area or where Stage II service is provided.

(2)
An aircraft conducting an instrument, visual, or contact approach has landed or has been instructed to change to advisory frequency.

(3)
An arriving VFR aircraft, receiving radar service to a tower-controlled airport within a Terminal Control Area, Terminal Radar Service Area, Airport Radar Service Area, or where Stage II service is provided, has landed; or to all other airports, is instructed to change to tower or advisory frequency.

(4) An aircraft completes a radar approach.
RADAR SURVEILLANCE - The radar observation of a given geographical area for the purpose of performing some radar function.
RADAR TRAFFIC ADVISORIES - Advisories issued to alert pilots to known or observed radar traffic which may affect the intended route of flight of their aircraft. (See Traffic Advisories)
RADAR TRAFFIC INFORMATION SERVICE - (See Traffic Advisories)
RADAR VECTORING (ICAO) - Provision of navigational guidance to aircraft in the form of specific headings based on the use of radar. (See Vector)
RADAR WEATHER ECHO INTENSITY LEVELS - Existing radar systems cannot detect turbulence. However, there is a direct correlation between the degree of turbulence and other weather features associated with thunderstorms, and the radar weather echo intensity. The National Weather Service has categorized six
(6) levels of radar weather echo intensity. The levels are sometimes expressed during communications as "VIP LEVEL" 1 through 6 (derived from the component of the weather radar that produces the information-Video Integrator and Processor). The following list gives the "VIP levels" in relation to precip intensity within a thunderstorm: