NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Exercise #16 High Altitude Sights near Noon
From: Hewitt Schlereth
Date: 2008 Jul 21, 11:30 -0400
From: Hewitt Schlereth
Date: 2008 Jul 21, 11:30 -0400
Jeremy - Wow, 10' zenith distance sights are really up there. I once did one at 20' and that had me dancing a complete circle around the cabin top of a 46-foot ketch. Thanks again for giving a notion of what a CG celestial exam question looks like. Hewitt PS Would the CG allow a bow-compass in an exam? I've used one for years in routine plotting because it makes a pencil line on the sheet instead of a dent. H On 7/21/08, Anabasis75@aol.comwrote: > > H > > > > I've long been curious to discover just how close one could come with > the super-basic method of advancing arcs or circles position at the > standard Universal Plotting Sheet scale, which is why I was glad to be > presented with Jeremy's example from a CG exam. > > Thanks again, > > Hewitt > > > Hewitt, > > If you look through my navigation notebook from the TS TEXAS CLIPPER, there > are at least 2 high-altitude sun sights. Unfortunately at that time, I did > not know about the methods of taking 2 shots a few minutes apart and didn't > do intersecting circles. If my memory serves me, the Z-distance was about > 10 nm, which actually was quite a hindrance to try and get position better > then that. > > Andres "cheated" a bit with the problem as he used a computer which > certainly wouldn't be allowed in the exam room, but it does show how the > circles work when reduced at sea. I haven't had the chance to shoot any > high altitude sun sights lately, but I will be mindful when I am at sea and > will try to get some if it is possible. > > Jeremy > > > > ________________________________ > Get fantasy football with free live scoring. Sign up for FanHouse Fantasy > Football today. > > > --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---