Navigation instrument for traditional celestial sighting and reliable angle measurement. Confident readings at dawn, dusk and under starlight help voyagers trust their bearings. How well does the Davis Instruments Mark 25 Sextant suit practical coastal navigation?
⚡ At a Glance
- • Measurement Precision: Accurate angular readings for celestial navigation
- • Best for: Sailors and navigators learning or practising traditional celestial techniques
- • Not ideal for: Users who rely exclusively on electronic GPS navigation
Includes a full field Beam Converger mirror, LED illumination for the arc and drum, and a 3x 27mm star telescope with seven sun shades. Suited to traditional sighting methods aboard small craft and teaching contexts.
Easier low-light readings – With LED-lit arc and drum
An LED light illuminates the arc and drum, making scale markings visible when ambient light is poor. The illumination targets the graduated surfaces used for angle measurement.
Allows taking sightings at dawn, dusk or under starlight without struggling to read the scales.
Clear star and sun sighting – With a 3x 27mm star telescope and seven sun shades
A 3x magnification telescope with a 27mm aperture helps resolve celestial bodies, while seven dedicated sun shades reduce direct glare during solar observations. The optics focus typical star and sun targets for visual alignment.
Makes it easier to distinguish targets for precise angle measurement, whether observing stars or the sun.
Full-field alignment – Thanks to the Full field Beam Converger mirror
The full field Beam Converger mirror presents overlapping fields of view so both direct and reflected images sit within the instrument's viewing area. That arrangement supports conventional double-reflection sighting techniques.
Speeds up target acquisition and helps achieve repeatable sights when lining up horizon and celestial bodies.
✨ The 4 Key Reasons for Davis Instruments Mark 25 Sextant
- Full field Beam Converger mirror – Faster alignment of horizon and celestial targets in rough conditions
- LED arc and drum illumination – Keeps scale markings readable during low-light or night readings
- 3x 27mm star telescope – Magnifies stars and landmarks for clearer, repeatable angular readings
- Seven sun shades – Control sun glare for direct-sun observations without extra filters
📋 Technical Details at a Glance
- Category: Sports
- Product Type: Sextant
- Brand: Davis Instruments
- Model: Mark 25 Deluxe
- Optical Magnification: 3x
❓ Frequently Asked Questions
Q: Does the arc have its own illumination for low-light use?
A: Yes, an LED light illuminates the arc and drum so graduations remain visible in low light.
Q: What telescope is included with the sextant?
A: A 3x 27mm star telescope is supplied for sighting stars and landmarks.
Q: How many sun shades are fitted?
A: Seven sun shades are provided to manage glare during solar observations.
🏆 Our Verdict
The Davis Instruments Mark 25 Sextant suits sailors, instructors and students who practise traditional celestial navigation. The combination of a full field Beam Converger mirror, LED-lit arc and drum, and a 3x 27mm star telescope with seven sun shades gives practical tools for accurate sighting. Optical and illumination choices should deliver dependable long-term value for those committed to non-electronic navigation.
