Engravable Mark 3 Sextant with Scope and Case

In stock
Dimensions & Weight:
Sextant -
9 3/8 inches (23.8 cm) wide, 9 inches (22.9 cm) tall, 5 1/4 inches (13.3 cm) deep
2 pounds, 8 ounces (1.13 kg)
Case -
13 inches (33 cm) wide, 10 1/2 inches (26.7 cm) deep, 6 1/4 inches (15.9 cm) tall

Product Features:
Calibrated, fully functional nautical sextant designed for marine navigation
Includes high quality 3.5 x 40 scope with a large 40 mm objective lens
Comes complete with a beautiful, high quality hinged hardwood case
Custom engraved aluminum plaque available for the hardwood case

Full Description:
The Stanley London Mark 3 Sextant represents the best quality marine sextant on the market for the price.  This is not a reproduction, but an accurate and calibrated fully functional nautical sextant for marine navigation.  The Mark 3 sextant incorporates all of the features of high-end German and Japanese sextants, at approximately one third the cost.  Do not be mistaken: This is a very accurate instrument of very high quality.  How can it be sold at one third the price?  The Mark 3 Sextant is made in China, where labor rates are considerably lower than in Germany or Japan, but where high quality equipment is available.  Further, the Mark 3 Sextant uses a lightweight, corrosion-resistant aluminum alloy, just as Freiberger, Tamaya, and C. Plath do in their lightweight sextants.  As a result, there is a very minor sacrifice in potential accuracy (+/- 20 arcseconds throughout the arc, compared with +/- 10 to 12 arcseconds), which is inconsequential compared to the human error when taking sights from a moving small vessel.  This Mark 3 is actually used by many professional navigators.

The Mark 3 sextant has revolutionized celestial navigation:  Never before has such a high-quality, accurate metal sextant been available at such a low price.  Tests by professional navigators produce results that rival those of the most expensive German and Japanese models.  This aluminum-alloy instrument at only 2 pounds, 8 ounces (1.13 kg) is easier to use than the traditional 4-pound brass models.  The quality of the Stanley London Mark 3 Sextant has been proven in many years of use by ocean-going navigators.  It is highly unlikely that any navigator regardless of experience could perform more accurate navigation underway in a small vessel with any other sextant, including those costing $2,400 or more.

The sextant's full 50 mm mirrors and shade glass are precisely machined and extensively tested for flatness using the Fresnel diffraction pattern method.  Mark 3 Sextants are assembled in a professional modern clean-room environment.  The sextant has the look and feel of a fine piece of precision engineering and is built to a very high standard.  The Mark 3 sextant's LED lighting of the arc and drum allows for convenient night sights.  Two standard AA batteries fit in the sextant's handle (batteries not included), and a convenient thumb switch controls the lighting. 

The Stanley London Mark 3 Sextant comes complete with a high quality 3.5 x 40 scope.  The scope has fully coated optics and a large 40 mm objective lens to yield a sharp 3.5-power non-inverted (upright) image.  Most sextants, like our Tamaya Spica Sextant, and our Tamaya Jupiter Sextant require optional $300 - $400 scopes.

The sextant comes with a beautiful, high quality hinged hardwood case to store and protect the instrument.  The case has a handle, two secure latches, and rubber feet on both the bottom and the back of the case to protect both the sextant, and your fine furnishings.  The case can hold the sextant, accessories, and two telescopes.  A handsome custom engraved brass plaque can be mounted on the front or the top of the hardwood case.

The Stanley London Mark 3 Sextant includes high quality sextant oil, an adjusting wrench, a brush, lens cloth, and a Quality Certificate specifying the sextant's +/-20 arcsecond accuracy throughout the arc. This sextant has a unique serial number and is fully functional and factory calibrated for navigation.

Lightweight Sea Water Resistant Aluminum with Corrosion Resistant Finish
Measuring Range:
-5 to 130 degrees
Arc Radius:
153 mm
Guaranteed Accuracy:
+/-20 arcseconds throughout the arc
Division on drum:
1 arcminute
Division on vernier:
0.2 arcminute
Index Mirror:
50 mm diameter
Horizon Mirror:
50 mm diameter
LED Arc and Vernier with Push Button on Handle
Illumination Power:
2 AA Batteries (not included)
Shade glasses:4 index shade glasses; 3 horizon shade glasses

Hardwood Case, Mirror Adjustment Key, Special Sextant Oil, Brush, Lens Cloth, Quality Certificate

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