NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: "100 Problems in Celestial Navigation"
From: Dave Weilacher
Date: 2004 Apr 1, 14:21 -0800
From: Dave Weilacher
Date: 2004 Apr 1, 14:21 -0800
I bought this book years back and gave up on it because it lacks proofs for the answers given. I had considered using this forum to help but couldn't figure out how to do that without infringing on the author's well deserved copyright. OTOH, answers 5-10nm different than his, aren't particularly unreasonable. HO229, HO249, and various plotting programs, etc, can have that kind of variation between them. Even using the same tables, a sight reduction form can introduce differences. If I recall his intro, he states that these are real life problems, and prone to having blunders and errors in them/ -----Original Message----- From: Renee MattieSent: Apr 1, 2004 2:03 PM To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM Subject: "100 Problems in Celestial Navigation" I'm having problems with "100 Problems" At Christmas, I received a copy of "100 Problems in Celestial Navitation Self-Contained -- with Answers" by Leonard Gray. I am having real problems working these problems. I can't make get the "right answer". I don't know why. I am not having trouble working Silcon Seas problems. The problems in 100 problems all seem extremely straightforward. You are given a most recent fix, a course, and a speed, and a new round of sights. You must figure your DR location at the time of the sights and plot your position. Straightforward. I figure I ought to come within 1-2 nmi of the author. But, after working the first 6 problems, I am finding myself 5-10 miles away from the author most of the time. Has anyone tried these problems? Any comments? Dave Weilacher .US Coast Guard licensed captain . #889968 .ASA instructor evaluator and celestial . navigation instructor #990800 .IBM AS400 RPG contract programmer