Marine Chronometer 398.0836

Megaquartz 2.4 MHz wristwatch graded as a marine chronometerMarine chronometerA precision timekeeper used aboard a ship to support determining longitude from accurate reference time. The term identifies a navigational instrument; its construction and testing depend on period and maker, rather than one modern wristwatch certification standard., “Marine ChronometerMarine chronometerA precision timekeeper used aboard a ship to support determining longitude from accurate reference time. The term identifies a navigational instrument; its construction and testing depend on period and maker, rather than one modern wristwatch certification standard.” on the bezelBezelThe frame surrounding the crystal at the front of a watch.; large rectangular steel case, developed with the Battelle institute.