.~.~ Lights communicate (e.g., direction, altitude, reference position to observer)
DEFINITION
Classification: 340/982
Lights communicate (e.g., direction, altitude, reference position to observer):
(under subclass 981) Subject matter wherein the beacons are visual signals which indicate to the observer information concerning the flight path or position of the aircraft.
(1) Note. For example, this information may be the direction, altitude, reference position etc., of the aircraft to the observer.