Davis Instruments 3 Marine Sextant Mark 0. Yet this model has taken sailors around the world too It is full-sized and has sunshades but no optical magnification to help you find dim celestial bodies. Comes with instruction booklet. Specifications for Davis Instruments Mark 3 Marine Sextant: Manufacturer: Davis Instruments Color: Black Package Contents: Davis Instruments Mark 3 Marine Sextant Davis Instruments 011: 3 Marine Sextant Mark