Davis plastic sextants have emerged as truly viable instruments for celestial navigation. Their accuracy is not as great as with metal sextants, and their errors vary with temperature, making frequent IC checks advisable. They make acceptable “first” sextants if finances are a constraint, and are always useful as back-up sextants. Otherwise a metal sextant will be easier to use and will give better feedback to the beginner as to how well they are doing. But once learned you can always get home with a plastic sextant. The MK 25, and MK 15 have the same basic construction. The former is gray in color, and is said to be of a more stable plastic which is resistant to temperature changes. The latter is black in color. The MK 15 has a traditional split mirror, and is non-illuminated while the MK 25 has illumination and a whole horizon mirror. Both sextants come with an instruction booklet, plastic carrying case, neck lanyard, 3x scope. and a sight tube. SW 7 lbs. (List price $284.99) Specifications Arc -5° to + 120°, radius 178mm Accuracy Unpredictable Micrometer 1′ scale, vernier 0.2′ Mirrors 50×38 mm index,42×29 mm horizon Shades 4 index, 3 horizon Weight 15 oz.
Davis plastic sextants have emerged as truly viable instruments for celestial navigation. Their accuracy is not as great as with metal sextants, and their errors vary with temperature, making frequent IC checks advisable. They make acceptable “first” sextants if finances are a constraint, and are always useful as back-up sextants. Otherwise a metal sextant will be easier to use and will give better feedback to the beginner as to how well they are doing. But once learned you can always get home with a plastic sextant. The MK 25, and MK 15 have the same basic construction. The former is gray in color, and is said to be of a more stable plastic which is resistant to temperature changes. The latter is black in color. The MK 15 has a traditional split mirror, and is non-illuminated while the MK 25 has illumination and a whole horizon mirror. Both sextants come with an instruction booklet, plastic carrying case, neck lanyard, 3x scope. and a sight tube. SW 7 lbs. (List price $284.99) Specifications Arc -5° to + 120°, radius 178mm Accuracy Unpredictable Micrometer 1′ scale, vernier 0.2′ Mirrors 50×38 mm index,42×29 mm horizon Shades 4 index, 3 horizon Weight 15 oz.
in 2 offers
Davis plastic sextants have emerged as truly viable instruments for celestial navigation. Their accuracy is not as great as with metal sextants, and their errors vary with temperature, making frequent IC checks advisable. They make acceptable “first” sextants if finances are a constraint, and are always useful as back-up sextants. Otherwise a metal sextant will be easier to use and will give better feedback to the beginner as to how well they are doing. But once learned you can always get home with a plastic sextant. The MK 25, and MK 15 have the same basic construction. The former is gray in color, and is said to be of a more stable plastic which is resistant to temperature changes. The latter is black in color. The MK 15 has a traditional split mirror, and is non-illuminated while the MK 25 has illumination and a whole horizon mirror. Both sextants come with an instruction booklet, plastic carrying case, neck lanyard, 3x scope. and a sight tube. SW 7 lbs. (List price $284.99) Specifications Arc -5° to + 120°, radius 178mm Accuracy Unpredictable Micrometer 1′ scale, vernier 0.2′ Mirrors 50×38 mm index,42×29 mm horizon Shades 4 index, 3 horizon Weight 15 oz.
Davis plastic sextants have emerged as truly viable instruments for celestial navigation. Their accuracy is not as great as with metal sextants, and their errors vary with temperature, making frequent IC checks advisable. They make acceptable “first” sextants if finances are a constraint, and are always useful as back-up sextants. Otherwise a metal sextant will be easier to use and will give better feedback to the beginner as to how well they are doing. But once learned you can always get home with a plastic sextant. The MK 25, and MK 15 have the same basic construction. The former is gray in color, and is said to be of a more stable plastic which is resistant to temperature changes. The latter is black in color. The MK 15 has a traditional split mirror, and is non-illuminated while the MK 25 has illumination and a whole horizon mirror. Both sextants come with an instruction booklet, plastic carrying case, neck lanyard, 3x scope. and a sight tube. SW 7 lbs. (List price $284.99) Specifications Arc -5° to + 120°, radius 178mm Accuracy Unpredictable Micrometer 1′ scale, vernier 0.2′ Mirrors 50×38 mm index,42×29 mm horizon Shades 4 index, 3 horizon Weight 15 oz.
Last updated at 29/09/2024 17:37:55
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originally posted on westmarine.com
originally posted on ebay.com
originally posted on westmarine.com
Item dimensions L x W x H | 33 x 27.9 x 12.7 centimetres |
Display Size | 1 Inches |
Length | 13 inches |
Number of Pieces | 1 |
Product dimensions | 33.02 x 27.94 x 12.7 cm; 1.59 Kilograms |
Updated about 12 hours ago
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Item dimensions L x W x H | 33 x 27.9 x 12.7 centimetres |
Display Size | 1 Inches |
Length | 13 inches |
Number of Pieces | 1 |
Product dimensions | 33.02 x 27.94 x 12.7 cm; 1.59 Kilograms |