Bad Kitty 252 Posted January 27, 2016 Share Posted January 27, 2016 OK so who knows anything about sextant & celestial nav? Is a frieberger like this any good? Want to learn that old school nav & keep a sextant, for when the zombies come & eat all the satelites! Quote Link to post Share on other sites
Black Panther 1,581 Posted January 27, 2016 Share Posted January 27, 2016 That is a very good brand, can't tell from the photo what model it is though (plastic or metal?) Looks like it has a card giving errors which is good, make sure there is a tool for adjusting the mirrors. Be nice if the mirrors were in good nick. Point it at the horizon with the arm at 0 degrees 0 minutes and see if the horizon is a straight line, then point it at a star (or a pin point far away) and rock the sextant through an arc and see if the two images split. Quote Link to post Share on other sites
wheels 543 Posted January 27, 2016 Share Posted January 27, 2016 It's a very good German made sextant. Fairly pricey new.Taking a sighting is fairly simple, although exacting. The more accurate you can get the sighting and the time, the more accurate the position you get. You need the book with the tables as well of course.BP, I might be wrong, but I think they only made the one yacht sextant and in Aluminium Quote Link to post Share on other sites
Black Panther 1,581 Posted January 27, 2016 Share Posted January 27, 2016 Then it's the same as mine. In perfect conditions I could get to 1/4 mile accuracy (in bad conditions I was totally lost). I think mine was about $1,000 40 years ago. Quote Link to post Share on other sites
erice 732 Posted January 27, 2016 Share Posted January 27, 2016 that's a full size frieberger drum sextant made in the ddr through the 80's with zeiss optics the friebergers?usually seen on tm are the alloy 3/4 size yacht sextant - straight bars vs. the curved cut outs i have the highly recommended mary blewett celestial nav book for you Quote Link to post Share on other sites
Island Time 1,233 Posted January 27, 2016 Share Posted January 27, 2016 Yeah, great sextant! Personally I've bought this for long term tables and sight reduction. http://www.amazon.com/Long-Term-Almanac-2000-2050-Reduction/dp/0914025104 Quote Link to post Share on other sites
Steve Pope 243 Posted January 27, 2016 Share Posted January 27, 2016 A good no nonsense sextant, as said they were / are made in the DDR. Zeis Optics are/were one of the best available. There will be a quite few Merlin nav calculators taking up room in some boaties cupboard, they can be extended into the 2020's as i understand it, worth getting if you can track one down. Of course there maybe be better systems available now. It is interesting to note that the American Navy is re-instituting teaching Celestial navigation, because all of a sudden someone realised that if the satellites die all their ships are quite literally lost. Quote Link to post Share on other sites
Island Time 1,233 Posted January 27, 2016 Share Posted January 27, 2016 The easiest celestial nav is a good sextant and Opencpn with the celestial nav plugin. All tables and sight reduction built in, and plots the position lines directly on the chart Quote Link to post Share on other sites
Black Panther 1,581 Posted January 27, 2016 Share Posted January 27, 2016 As long as the reason you are resorting to celestial isn't because your computer has died. Quote Link to post Share on other sites
Island Time 1,233 Posted January 27, 2016 Share Posted January 27, 2016 True. Hence the tables above. But BK's post above he was saying for the event of no gps sats. Sats & GPS might die PC might die Handheld calc might die charts and tables might get wet and unusable, or navigator might fall and break sextant. DR then I guess.... Oh yeah, Crew (and or Skipper) might die too!! Quote Link to post Share on other sites
Black Panther 1,581 Posted January 27, 2016 Share Posted January 27, 2016 WHY DO WE DO IT????????? BK - go for the sextant, it's a goodie. Quote Link to post Share on other sites
marinheiro 352 Posted January 27, 2016 Share Posted January 27, 2016 If you want it checked/serviced, Dave the compass man in Bayswater can do it Quote Link to post Share on other sites
Bad Kitty 252 Posted January 27, 2016 Author Share Posted January 27, 2016 True. Hence the tables above. But BK's post above he was saying for the event of no gps sats. Sats & GPS might die PC might die Handheld calc might die charts and tables might get wet and unusable, or navigator might fall and break sextant. DR then I guess.... Oh yeah, Crew (and or Skipper) might die too!! Don't worry IT, you're in Open CPN lessons just got longer & more involved! We'll be talking, Quote Link to post Share on other sites
wheels 543 Posted January 27, 2016 Share Posted January 27, 2016 that's a full size frieberger drum sextant made in the ddr through the 80's with zeiss optics the friebergers?usually seen on tm are the alloy 3/4 size yacht sextant - straight bars vs. the curved cut outs Actually erice is correct. It's the full size drum sextant and worth about 2x the cost of the yacht sextant. I don't own a sextant and when ever I see one on trademe, I keep thinking that would be really cool to have. But it is never near the top of my lost. However, I read survive the Savage Sea over Christmas and I was so highly impressed by the guy navigating his family toward land and safety with unbelievable accuracy (although he didn't have a sextant on the life raft) that I though wow have many of us lost an important skill with the relying on of electronics. By the way, I don't recommend reading a book on being Ships wrecked and fighting for you life in survival while cruising. And even worse, don't read two books on that subject. However, I do highly recommend reading the story of the sinking of the USS Indianapolis "In Harms Way" and the story of the Robertson Family and their epic story of their survival after their Yacht was sunk by Orca off Galapagos Islands and they "sailed" their Liferaft and then dingy for 39 days and over 700Miles toward South America. Found this site for you with a pic and info of both. https://mdnautical.com/freiberger-sextants/19728-freiberger-drum-sextant.html Quote Link to post Share on other sites
Black Panther 1,581 Posted January 27, 2016 Share Posted January 27, 2016 I have a 1 page site workings cheat sheet the ye olde shops captain who taught me gave me way back in the day. I'll dig a copy out. I'd like to see that. A good friend used it to get a well known Kiwi race boat out of the poo a few years back. Quote Link to post Share on other sites
marinheiro 352 Posted January 28, 2016 Share Posted January 28, 2016 I had a Merlin but it died and was junked. Problem with them was if you did not keep the battery current they lost the programming and data. It was designed by a surveyor in Perth, Mike Pepperday. He updated my Merlin after it had lost its programming, later it would not switch on at all. If you can find an operational one I believe Boat Books in Sydney can reprogramme it Quote Link to post Share on other sites
JK 28 Posted January 28, 2016 Share Posted January 28, 2016 You can get an app for anything these days: https://itunes.apple.com/us/app/starpilot/id359071446?mt=8 Quote Link to post Share on other sites
grantmc 59 Posted January 28, 2016 Share Posted January 28, 2016 Celestial navigation is still a major component of the Ocean Yachtmaster curriculum. And they don't allow the use of sight reduction tables. You have to work out the full PXZ triangle equation from sextant readings (at least they do allow a scientific calculator!). I well remember us all spending a Sunday afternoon off Paekakariki beach getting sunset sights. Using a sextant is still a good skill. And of course an aspect of attaining Cat 1 is some proof the crew know what they're doing. Quote Link to post Share on other sites
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