NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Teaching a Running Fix
From: Gary LaPook
Date: 2009 Dec 12, 13:49 -0800
From: Gary LaPook
Date: 2009 Dec 12, 13:49 -0800
Me too. gl On Dec 12, 1:20�pm, "Guy Schwartz"wrote: > I liked to see the presentation. > Thanks > Guy > > -----Original Message----- > From: navlist@fer3.com [mailto:navlist@fer3.com] On Behalf > > Of Lu Abel > Sent: Saturday, December 12, 2009 1:03 PM > To: navlist@fer3.com > Subject: Re: [NavList 11103] Teaching a Running Fix > > Joe: > > I've taught this many times. � The way I explain it to my students is to > tell them to imagine that at the time of the first bearing the sighted > object suddenly clones. � One of the clones stays in the original > position. � The other clone moves on exactly the same course and at > exactly the same speed as the vessel. �I demonstrate to them that the > bearing to the moving clone stays the same as the vessel advances, but > the position of the bearing line moves along with the vessel. � You then > take a second bearing back to the original object and cross the two. > Most of them say the image of the clone of the lighthouse moving along > with the vessel helps them understand the (not naturally intuitive) > concept of advancing a line of position. > > In fact, I put this into a set of PowerPoints that won a national award > from the US Power Squadrons. �I can send you a copy off-line if you > desire (or, if there is demand, I can post it in the archives)\ > > I work in high-tech and have lived in high-tech areas (first Boston and > now Silicon Valley) and my classes have always been a challenging > combination of engineers and other way less mathematically proficient > people. � Teach currents? � The engineers say "easy, it's vector math, > let's go on to the next topic" while the others' eyes glaze over.... � > So I've always found a challenge in explaining concepts (like running > fixes) in ways that won't bore the engineers while helping get the > non-engineers on board. > > Lu Abel > > joseph_schu...@rrv.net wrote: > > A challenge, in the spirit of the intention of this list, which is the > promotion of the use of traditional navigation techniques. > > > You're tutoring a small group of new navigators. �Normal people, ranging > in age from 12 to "retired." > > > Here's what they can do on a paper chart/map: > > 1. Plot a track. > > 2. Plot and label DR positions, using > > > � � �distance = speed x time > > > 3. Plot and label a line-of-position to a visual object, understanding > that it take two or more simultaneous LOPs to constitute a fix. > > > Your mission, if you choose to accept: close the schoolbook. �Explain, in > words your students can understand, the concept of a running fix. > > > No grades, no judgement. �I'm interested in learning how you'd teach it. > > > Joe > > -- > NavList message boards:www.fer3.com/arc > Or post by email to: NavList@fer3.com > To , email NavList+@fer3.com > No virus found in this incoming message. > Checked by AVG -www.avg.com > Version: 8.5.427 / Virus Database: 270.14.104/2560 - Release Date: 12/12/09 > 07:38:00 > > -- NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList+@fer3.com