The top of the line Davis plastic sextant, the Mark 25 features our Beam Converger™ 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 illu. HOW TO FIND YOUR POSITION WITH A SEXTANT This booklet has been written as an introduction to your new Davis sextant. By studying its pages, you will learn how to operate your sextant, how to find the altitude of the sun, and how to use your readings to calculate location. The meridian transit method of navigation described is both easily. USING YOUR DAVIS SEXTANT This booklet gives the following information about your new Davis Sextant: • • • • Operating the sextant Finding the altitude of the sun using the sextant Using sextant readings to calculate location Other uses for the sextant To get the most benefit from your sextant, we suggest you familiarize yourself with the meridian transit method of .
Note: Every sextant exhibits some difference in readings when turning toward higher or lower angles (called backlash error). Always make the final movement of the knob toward a higher angle. Reading the Sextant Scales. The Davis Mark 15 and Mark 25 sextants have three scales that give readings to 2/10 of a minute. PLASTIC SEXTANTS. Starpath School of Navigation is one of the world's leading resources on all aspects of celestial navigation, including use of all types of sextants, but in many ways we are an even more unique resource when it comes to plastic sextants. We have used them for decades, studied their properties, and written special step-by-step. Master Sextant User's Guide , Rev. F October Total pages 24 Trim to x 8. PAGE 2. Replacement Parts Contact your local dealer or Davis Instruments to order replacement parts or factory overhaul. PAGE 3.
The top of the line Davis plastic sextant, the Mark 25 features our Beam Converger™ 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. (MANUAL) Mark 15 25 Sextants User's Guide Updated 5 months ago by Davis Instruments Download here. (MANUAL) Mark 3 Sextant Manual Updated 5 months ago by Davis Instruments Download here.
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