a very-high-frequency ground radio navigational system to assist a pilot in plotting his or her exact position
omnirange in American English
(ˈɑmnɪˌreɪndʒ)
US
noun
a navigational system for aircraft in which a network of ground stations send out VHF radio signals that control a display on the instrument panel of an aircraft, showing the pilot the heading of the plane in relation to the source of a specific signal