Marine Sextant, Davis
Score By Feature
OveReview Final Score
Product Description
Questions & Answers
The answer is yes. A booklet in English was sent to me. I found it to be very helpful and comprehensive. You can now use the sextant right away.
It is true. Marine navigation can be made very simple using this system. You can easily transport it on your travels, it is light, and it does not cost much. Most expensive marine sextants have half horizon mirrors just like this one and they all work fine. (Freiberger Yacht and West & Co. Just to give you a couple of examples) Your brain adapts to the image so that you will see the body on the horizon even when you move
To provide readings in both degrees and minutes, the Mark III Marine Sextant uses a Vernier scale (see Wikipedia Here's the link Translate to English. According to Wikipedia. Vernier_scale at http//en.wikipedia.org). In this way, the scale at the top represents the measurement for the degrees, shown on the lower scale by the first mark on the left. In reading the minutes, the upper and lower marks in both scales should align as closely as possible in the lower scale
Selected User Reviews For Marine Sextant, Davis
A class on Celestial Navigation was just completed for 8th-grade students at home This is your 10th grade year. We had to buy this sextant for class as a requirement. There are no issues using it, it wipes clean easily, and it is easy to adjust for accuracy. I also found the booklet that came with it to be extremely Over the course of eight weeks, students met once a week. The students all knew how to take sights from the Sun, Moon, and about 15 stars by the end of the class. With this sextant, they were able to calculate their index error very easily. There were no index errors + or - for any of the students It is a 3° angle. If you need an emergency backup sextant or a way to get started on sextants at a low price, then you can't go wrong with this device! You should familiarize yourself with Celestial Navigation if you are new to it. Take a look at the videos on NavigationTraining's YouTube channel. Throughout my CelNav educational journey, they were a terrific resource.
Though I've seen criticism from those with little experience with navigation, it is beyond my knowledge and experience to discern any major flaws. I was not able to discern any serious issues with the product. My expectations were met and I am fully satisfied with the outcome. A better deal is not to be found anywhere else. bought at my local hardware store was DECORATIVE ONLY, despite misleading labeling and an instruction manual claiming it to be functional. included filters on this sextant are insufficient for viewing the sun, so if you intend to use it that way, I recommend the purchase of a dedicated A notable criticism was that the plastic body of the sextant could be seen in the viewing mirror, indicating that the mirror was not perfectly parallel to the body of the sextant. I believe, however, that this is a misunderstood notion of geometry, since a perfectly perpendicular mirror would still show plastic in its margins. A true design flaw is not a result of this, as it does not interfere with the functioning of the system.
I give it five stars.
The sentence could be improved easily. Celestial navigation was of interest to me, and I learned it via YouTube and the internet. The sextant I used for practicing was the Mark 3. The price is reasonable, but the accuracy is good, and there is no better way to practice than with this software. During practice, I used an artificial horizon of Davis (you can make your own since it's what you would use to make mirrors as it's just a reflecting fluid (eg. , calculated my height using an app (my position is assumed to be my GPS location) and managed to get an average of 2 minutes of accuracy (approximately 2 NM). Having the concept and putting it on your boat for fun (good also as a backup if you prefer) is totally sufficient for today's purpose of getting the concept and putting it to use. However, I would like to focus on Both index shades and the horizon shades are unable to dim the area adequately. I can still feel the sun's too bright image after closing my eyes on a sunny day, as if it is still on my retina for a while. No matter how many shades you use, you still feel uncomfortable looking into the sun. Consequently, I used another layer of sunglass foil to darken The only thing I hope with the regular sunshades is that it will dim UV400 rays sufficiently, but have not been able to find any The sun remains convenient dark, but it does not mean that your retina is not exposed to UV rays that can damage it. The second is
2. In addition to confirming what I said previously, I confirm the horizon mirror shows only the sextant in its right third and the index mirror in the left third (and therefore To make your sights clear, it is adequate There is no doubt about it The mirror's 30% of size is not useful if it is aligned this way. A little bend of the horizon mirror allows a larger portion of the index mirror to be seen in the image Nevertheless, since the bend is fixed, you cannot adjust it and the curtain bends backwards. . . . (only the index mirror is adjustable in both directions) * * 4. Markings on these pages can be easily removed with ink. After only a few views, it began to blur and disappear at the ends. If you could work on this, Davis, and use better ink, that would be great. We face the following As a result of the rubbing off from the ends, it is very difficult to find matching lines, a fundamental In the end, I had to blacken them again with a waterproof marker, which does not give the same precision as before. Accordingly, one may see a jump in markings Next one to the left, still to the left, matching, again to the You are now on the right, farther to the
All in all, we can say this This is a simple sextant that in theory should do an excellent job However, the issues mentioned in the previous paragraph really should be addressed. The score would have been a 5 if those items had been fixed.
On the one hand, it is a very reasonable, useful tool. But on the other hand, it often has a serious flaw - the horizon (lower) mirror is often misaligned, and therefore Through the eyepiece, you can only see the side of the sextant reflected in the right side of the horizon mirror. From the index mirror, the image is reflected on only the left side of the horizon This should be done so that the horizon mirror is parallel to the side of the sextant, so it reflects the whole image from the index mirror (see On page 7, you will find the following statement But it is tilted to the right and only reflects the right side of the index mirror, as in picture 6 of the instruction booklet. When I informed Davis about the problem, they sent me a second sextant, but the issue was even worse this time. By measuring with calipers, I gauged the distance to the horizon mirror The index mirror has a width of 17 mm. The first sextant showed the image of the index mirror in just the left 8 mm of the horizon mirror, meaning just On the other hand, the left 6 mm of the second sextant represented 35% of the image. the image reduces to 0 mm, the sextant ceases to function. notified Davis again, Image was clearly visible in the left 11 mm of the horizon mirror, or 65% of the mirror. Therefore, I kept the third sextant since it looks great and functions well, and I discarded the other two. Make sure to check the horizon mirror before storing the sextant away to be used in an emergency lifeboat.
Related Products For Marine Sextant, Davis
