NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: 3-Star Fix - "Canned Survival Problem"
From: Mike Burkes
Date: 2008 Jun 13, 06:34 -0700
From: Mike Burkes
Date: 2008 Jun 13, 06:34 -0700
Captain Lecky would be proud of those dividers ha! Speaking of interpolation I have found a neat way to get around that pesky DSD and interpolation tables by using the aviation E6B computer or the equivalent nautical slide rule. Essentially the set up:d-value/60=d- correction/declination minutes. Yes the calculator offers the proof. Mike Burkes On Jun 12, 11:44�pm, Anabasi...@aol.com wrote: > Thanks for the nice exercise Greg. �I literally had to dust off the �ship's > Vol III of HO 229 and deflower a Plotting sheet 925 to work this one �out. > > Since I was bereft of electronic gadgets, I did this with a plotting sheet, � > 2 triangles, a pair of dividers, 2 books, a pencil, and small piece of scratch > �paper (wouldn't have reams of paper in the Lifeboat). �I have attached a � > picture in to this message with the plot and the tools. > > My Lat is a bit lower (plotting or math error?). �I used an assumed �position > method and HO 229. �I had to assume we were drifting and no �current (didn't > advance or retard the lines). �I had not done a full HO 229 �paper reduction > of a star in many years, and I had to think a second to remember �how to use > the interpolation pages on the inside covers for the declination �interpolation. > �I usually whip those off with the calculator. �Still, �I got pretty close to > the computer solutions with Lat 34deg 11.9' N and �Longitude 119deg 16.0'W. > > As to how you would get an Eastern sight on the west coast, you would have �2 > options in general. �The first would be a back sight. �This would be � > particularly difficult with a regular sextant at such a low altitude. �The �other > option would be to use a bubble sight tube or other artificial �horizon. �If you > were across a bay, you could also use a dip short of �the horizon table. � > That's all I can think of at the moment. > > Jeremy > > **************Vote for your city's best dining and nightlife. City's Best > 2008. � � �(http://citysbest.aol.com?ncid=aolacg00050000000102) > > �gregExerPlot.jpg.JPG > 182KViewDownload > > �GregExerTools.jpg.JPG > 129KViewDownload --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---