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    Re: Cugle - longitude at sunrise and sunset
    From: Gary LaPook
    Date: 2013 Apr 30, 13:33 -0700

    Hm-mm, "Not to be entirely relied upon....a fairly good idea of his longitude" when taken from a ship at sea level. I notice that the computation requires the use of haversines, Noonan only had HO 208.

    Are you going to bet your life on this procedure, looking for a small island from a plane without knowledge of the proper dip and negative altitude refraction corrections from altitude? Another thing that people forget, procedures that might be useful on a ship, with virtually unlimited endurance, are not very useful in a plane with only a couple of hours of fuel. If the shipboard navigator can't get an accurate fix when approaching a landfall he can heave to or stand off and on until he gets one. A flight navigator doesn't have this luxury.


    --- On Tue, 4/30/13, Dave Walden <waldendand---.com> wrote:

    From: Dave Walden <waldendand---.com>
    Subject: [NavList] Cugle - longitude at sunrise and sunset
    To: garylapook---.net
    Date: Tuesday, April 30, 2013, 12:56 PM

    from my 1938 cugle
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