Radio fix

1. The locating of a radio transmitter by bearings taken from two or more direction finding[?] stations, the site of the transmitter being at the point of intersection.

2. The location of a ship or aircraft by determining the direction of radio signals coming to the ship or aircraft from two or more sending stations, the locations of which are known.

Source: from Federal Standard 1037C and from the Department of Defense Dictionary of Military and Associated Terms