NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Current Sextant Manufacturers
From: Alexandre Eremenko
Date: 2012 Mar 31, 08:43 -0400
From: Alexandre Eremenko
Date: 2012 Mar 31, 08:43 -0400
Bill and Geoffrey, I gues no modern (XX century) navigation manual mentions back sights or Lunars. But all of them mention horizontal angles between shore objects. This is what "sextants" and more that 100d arcs are for. You can frequently see a "3-armed protractor", the device that permits to plot your position from two such angles without any calculation. I have one of those "protractors": it has a ridiculous accuracy of 1' (complete with 2 sextant-type drums and worms!). Ridicuous for a plotting device, of course. So its accuracy is higher than the size of a pencil dot on a map. This was certainly intended to use together with a sextant. Alex. On Sat, 31 Mar 2012, Geoffrey Kolbe wrote: > > At 07:22 31/03/2012, you wrote: >> On 3/30/2012 5:45 PM, Alexandre E Eremenko wrote: >>> Why else one wold need 140d at sea... >> Back sights? > Hmm....come to that, why would you want 120 degrees at sea today? > Nobody does lunars - right? > > Why are sextants these days....sextants? > > Geoffrey > > > > > > : http://fer3.com/arc/m2.aspx?i=118595 > > >
