The tool in question is an astrolabe, an ancient instrument used by sailors to ... guessed it was an astrolabe but could not spot the navigational marking to confirm their assertion.

The nocturnal is a navigational instrument that was first invented in the 16th Century. By focusing on the stars it can estimate the time to within 10-15 minutes. The outer edge of the instrument ...

The Ritchie system sends a single precise heading from the MagTronic sensor to an auto-pilot and all navigational instruments, including Loran, GPS, Sat/Nav and radar. The helmsperson then sets ...

Roger Revelle is equipped with an extensive suite of navigation and communications instruments and devices. This equipment allows precise navigation and control of the ship and worldwide ...