WordNet
navigational instrument
n. an instrument used for navigating
Wikipedia
Navigational instrument
Navigational instruments refers to the instruments used by nautical navigators and pilots as tools of their trade. The purpose of navigation is to ascertain the present position and to determine the speed, direction etc. to arrive at the port or point of destination.
Usage examples of "navigational instrument".
Pitt said, his eyes locked on the navigational instrument displaying his coordinates.