NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Silicon Sea Leg 69: ANSWERS
From: Dan Hogan
Date: 2001 Apr 10, 01:26 EDT
From: Dan Hogan
Date: 2001 Apr 10, 01:26 EDT
On 9 Apr 2001, at 15:59, Yves Arrouye wrote: > Dan, > > For the newcomers here like me, could we get the inner workings of the > solution to what may be our first problem? That would really be nice. Go to page http://www.angelfire.com/nt/navtrig/index.html, it's an example of a Silicon Sea problem. > I did questions 1, 2, and 4, and then when the solution came here, I kind > of lost interest :) (It would be great to wait more than 5 days to give a > solution; maybe a full week?). I have no argument. At one time members were asking for a quick response on the answers. > Below are some of my questions. > > > 1. FIX= 9d 50.0'N 53d 00.2'W > > > > 2. TC= 298.1d > > Dist= 424.6 Nmi > > I tried to apply the mid-latitude sailing formula from 4mulas.txt and got > TC = 298 but Dist = 379 Nm. I would appreciate if somebody could see if I > made an obvious error, and also explain what method was used (w/ > reference) to get to the above numbers if mid-latitude sailing wasn't used > (maybe it doesn't make sense to use it?). Make sure that you calculated Diff in Lat, the DLo and Mid-Latitude(Lm) correctly. I get D= 419.1 Nmi and TC= 298.5d using my Mid-Latitude. Also most Tables are calculated to 4 places using one-place can tend to accumulate error if the calculations are strung together. Dan Hogan WA6PBY Catalina 27 "GACHA" dhhogan@XXX.XXX Navigation-L List Owner http://www.wa6pby.com