CELESTIAL GUIDANCESTAR TRACKERSSTELLAR MAP MATCHINGCELESTIAL NAVIGATIONGUIDANCESTELLAR GUIDANCE (NPT) AUTOMATIC DIRECTION OF MISSILES, SPACECRAFT, ETC., BY INSTRUMENTS WITHIN THE VEHICLE THAT SENSE THE POSITIONS OF STARS AND OTHER CELESTIAL BODIES. FOR POSITION-FINDING TECHNIQUES IN WHICH NAVIGATORS DETERMINE GEOGRAPHIC LOCATIONS BY CELESTIAL OBSERVATIONS, SEE CELESTIAL NAVIGATION.