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A correction to my message below.  It is all correct except you must set
0 degrees NOT TH in the counter window.

Phil

On 6/19/2011 10:22 PM, Phil Rider wrote:
> An airline navigator taught me the easy way was to use TH-ZN.  Set TH in the 
counter window and then subtract ZN from TH.  In many cases you have to add 
360 to TH before doing the subtraction.  The result of TH-ZN is what you set 
the lubber line to in the optical window by rotating the sextant.
>
> Same thing you are doing and the TH-ZN thing was a way to remember what to 
do.  Quick and easy and it only takes a few seconds during Pre-Comp.
>
> Phil
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