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    Re: Exercise #16 High Altitude Sights near Noon
    From: Hewitt Schlereth
    Date: 2008 Jul 20, 15:47 -0400

    152 NM is a mistype on my part. It should be 1*52' -  the zenith
    distance of the1112 sight, which just happened to be the maximum
    extension of my compass.
    The method I used was to advance the two circles-of-position, the 1112
    having a radius of 1*52' and the 1121 a radius of 1*26.1'.
    On 7/20/08, Anabasis75@aol.com  wrote:
    > Thanks for trying this Hew!
    > I'm a big confused how you get the number "152 nm?"  The 1112 sight has an
    > HO of 88 deg 06'.  That should equal a zenith distance of 1 deg 54' or 114'
    > minutes/nm.  The 1121 sight has a Z-dis of 86.1 minutes/nm.  The only thing
    > I can think of is that you have a different method of advancing the LOP's to
    > noon?
    > I'll post the correct answer with my method of solution in a few days.
    > Jeremy
    > In a message dated 7/18/2008 9:13:31 P.M. Eastern Daylight Time,
    > hhew36@gmail.com writes:
    > Your example from the CG test intrigued me because it's a case of
    > altitudes so high you can put the GPs down on a plotting sheet, swing
    > the arcs of the zenith distances and use the DR to choose which of the
    > two points where the arcs intersect to decide which point is the fix.
    > I did this on a VP-OS Universal Plotting Sheet - the one where a NM is
    > about one millimeter. Because I don't have a compass large enough to
    > draw an arc with a radius of over 152 NM, I couldn't change the scale.
    > Anyway, I came up with a position of 19*22' S, 6*38' E, which is very
    > close to the 1200 DR of 19*20.3' S, 6*39.3' E. Closest position on the
    > answer sheet is A.
    > Check me on this, if you've got the time.
    > Thanks, HewS
    > ________________________________
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    > Football today.
    >  >
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