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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'.

HewS

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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>  >
>

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