But before you can lay down the LOP you first have to lay out the intercept. So you can set the plotter so that you count degrees from a parallel to plot the azimuth and then mark off the intercept along this azimuth line then place the plotter on the azimuth line so that it is perpendicular at the intercept and draw the LOP. Personally, I use the "flip-flop" method, see:
http://fer3.com/arc/img/105150.pages%20from%20afpam11-216.pdf
http://fer3.com/arc/m2.aspx/FlipFlop-Method-LaPook-may-2011-g16389
http://fer3.com/arc/m2.aspx/Plotting-tools-LaPook-may-2008-g5150
gl
--- On Wed,
12/5/12, Paul Hirose <cfuhb-acdgw@earthlink.net> wrote:
From: Paul Hirose <cfuhb-acdgw@earthlink.net>
Subject: [NavList] Re: Z vs Zn
To: NavList@fer3.com
Date: Wednesday, December 5, 2012, 5:22 PM
Gary LaPook wrote:
> Interesting, you're right, you don't actually need to make that last math error, er, conversion to Zn in order to plot the LOP. Well, you do, at least in your head, because the roses on charts and plotting sheets do not have the proper scales for Z. Now if somebody made an aircraft plotter with a second scale running counter clockwise (actually, clockwise because the scale on an aircraft plotter already runs counter clockwise because how it is used) then it would be simple to just use Z.
No special scale is needed, Gary. Ignore the numbers and count degrees
in the appropriate direction. For example, suppose the south pole is elevated, the body is west of the meridian, and Z = 33°. I.e., the body bears roughly SW by S. Set the plotter at right angles to a meridian. That's the orientation of a celestial LOP if Z = 0. Then rotate the plotter clockwise: "There's 10, 20, 30... 33." The numbers are merely a visual aid to help your eye count tens. It doesn't matter what they say.
This is easier to do than explain. Once the trick is learned, you can forget the azimuth rules.
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