Anything that provides guidance; a guideline.
A signpost.
A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of sent radio waves (usually microwaves) reflected from their surfaces
A type of system using such a method, differentiated by platform, configuration, frequency, power, and other technical attributes.
An installation of such a system or of the transmitting and receiving apparatus.
A superior ability to detect something.
To scan with radar, or as if with radar.