Answer: telerans

AnswerCrossword Clue
TELERANSAids to aerial navigation.
TELERANSNavigation systems featuring TV
TELERANSAids to aerial navigation
teleransnavigational aid that uses radar to map the sky above an airfield, which, together with a map of the airfield itself, is transmitted by television to aircraft approaching the field
teleransTELERAN, a system of air navigation