(under the class definition) Subject matter relating to the use of a star for determining an object's position, course, or distance traveled in relation to a reference such as the surface of the earth.
SEE OR SEARCH THIS CLASS, SUBCLASS:
186, for means for instructing in the use of magnetic or gyro compasses.
239+, for means for instructing the use of radio navigation apparatus.
SEE OR SEARCH CLASS
701, Data Processing: Vehicles, Navigation, and Relative Location,
