Celestial Navigation (527)

accuracy agency aircraft album angular arc arm bearing bodies bowditch bridge celestial chart charted chronometer circle compass concepts consists content current details determine display ecdis electronic error event external fixing frequency global gmt gnss gps height horizon imagery imo inertial integrated involve kingdom latitude location longitude loran maintain maloney manual map mapping marine md measure meridian mirror national nautical navigating navigation navigational navigator notes object observation observer omega orienteering passage piloting plot positioning positions practice precise primary radar rdf receivers reckoning referred resolution restricted retrieved satellite search sextant ship sight sighting signal speed sphere star technique united users version vessel voyage watch waters wing