Davis Mark 15 Master Sextant

The Davis Mark 15 Master Sextant is a precision celestial navigation instrument designed for serious boaters, maritime professionals, and backup navigation enthusiasts who demand accurate position fixes when GPS is unavailable. Built by Davis Instruments—a trusted name in marine navigation for decades—this sextant bridges traditional seamanship with modern reliability. Whether you're crossing open ocean, teaching celestial navigation, or maintaining emergency navigation capability aboard, the Mark 15 Master delivers the accuracy and durability required for critical wayfinding at sea.

Weighing 3.45 pounds and measuring 11 x 5 x 13 inches, the Mark 15 Master combines portability with optical precision. The instrument features a solid construction that withstands the harsh marine environment—salt spray, temperature swings, and constant motion—while maintaining index arm accuracy essential for sun and star sights. The optical path and graduated arc are engineered to resolve celestial bodies with the precision required for ocean navigation, and the sextant's compact footprint makes it practical for cockpit use even aboard smaller vessels.

Its balanced design reduces fatigue during extended observation sessions, a critical consideration when taking multiple sights throughout the day. This sextant suits navigators who operate beyond cellular and satellite coverage, emergency preparedness-minded skippers, maritime academies, and cruising sailors building traditional navigation competence.