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    Re: Kollsman periscopic sextant mount
    From: UNK
    Date: 2011 Jun 19, 22:44 -0500

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