Davis Mark 25 Deluxe Sextant 025

Binnacle.com #:  20036
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Davis Mark 25 Deluxe Sextant 025

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With a high-efficiency LED illumination system, which floods Arc and Drum with soft light. The LED will last for the lifetime of the sextant.
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Binnacle.com:   #20036
MFG Part#:   025
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Davis Deluxe Mark 25 Sextant with full-field dielectric Beam Converger

The top of the line Davis plastic sextant, the Mark 25 features a Beam ConvergerTM mirror, sometimes referred to as a "full horizon mirror". A special coating is applied to high quality optical glass to allow the user to see through this mirror, yet still pick up images as faint as low-light stars.

The Mark 25 is illuminated by a long-life LED and made of an upgraded grey plastic that is very stable.

  • Full-field Beam Converger with quartz hardcoat replaces conventional half-silvered mirror. Horizon and astrobody images are combined in a single full-field for easy, reliable sights under the most difficult conditions.
  • Special mineral coating is selective for different wavelengths of light. Horizon is transmitted in one color region and the star or sun in another.
  • Improved reinforced plastic stiffens frame for greater measurement accuracy.
  • High-efficiency LED illumination system, which floods Arc and Drum with soft light. The LED will last for the lifetime of the sextant (average LED "half-life" is approx. 10 years if operated continuously). Batteries, which are included, will last up to 10 times longer than with regular bulbs.
  • Positive "push-on" switching action with vinyl boot water protection.
  • Professional specifications:
    • 7" (178 mm) frame radius. Graduation 120 degrees to -5 degrees.
    • Rectangular index mirror, 1.98" x 1.49".
    • Precision machined slow travel gear and worm mechanism.
    • Highly visible, easy-to-read micrometer drum and vernier allowing readings to 2/10 minute of arc.
    • Fully ribbed, 3-circle sextant body for platform strength and stability.
    • Large, contoured handle designed for sure, steady grip and angled back for added control.
    • Seven large sunshades allow complete, independent adjustment of shading density for horizon and index mirrors.
    • 3 x 27 mm Star telescope with anti-reflective coated glass lenses, plus separate hooded sight tube for glare-free sun shots.
    • Neck lanyard frees hand and protects sextant.
    • Tough, fully padded, shock-resistant carrying case with compartments for extra batteries and mirror kits.
    • Beam Converger with Viewing field: 1.61" x 1.16" (43 x 29 mm).
    • LED on both Arc and Drum, uses two 1.5V AAA batteries. 
    • Weight 16.5 oz.

  Davis MK 15 & MK 25 Sextant Users Guide
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