# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: set and drift....again
From: John Huth
Date: 2011 Nov 12, 09:37 -0500
Gary -

Thanks, I've updated this for my students with "course".

Also, my head TF created a Mathematica notebook to display the vectors from the spreadsheet.   I'm hoping to incorporate those into a web-friendly calculator with the graphic solution.

This is a bit of a fortuitous discussion, as I talked about ocean currents last week in my lectures, and I'll be doing vessels and sails this week, along with a discussion of leeway.   I wanted to eliminate the tedium of the calculations for the students, but have them do some 'real world' exercises that are a combination of factoring set, drift, leeway and plotting solutions on a Mercator grid, then comparing to some celestial data I give them.   It's a paper exercise, but the but the best we can do as land-locked by other factors.

John H.

On Fri, Nov 11, 2011 at 7:38 PM, Gary LaPook wrote:
 The law of sines comes up with the same answer as  does the MB-2A. Either of these other methods are less complicatd. As a suggestion, you should call the desired way to go as "course" not "heading." You sail (or fly) a heading which incorporates a correction angle (wind correction angle) so that you maintain the desired "course." "Heading is the direction in which the nose is pointing at the moment."Course" is the direction of the line on the chart.gl--- On Fri, 11/11/11, Apache Runner wrote: From: Apache Runner Subject: [NavList] set and drift....againTo: NavList@fer3.comDate: Friday, November 11, 2011, 12:15 PMThere were problems with the list - so trying again.   Attached is a spread sheet to calculate heading for desired heading with a current.    If anyone can test drive it to see if it breaks down, I'd appreciate it. John H. -- Keeping up with the grind

--
Keeping up with the grind
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