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    Re: Navigation exercise
    From: Peter Fogg
    Date: 2008 May 17, 06:33 +1000
    Good on you, Jeremy.  Its been a long time since we had practical nav exercises put up here.  I imagine that they may be greatly appreciated by many NavListers.

    Just a couple of issues:
    Although Americans, bless them, use mm/dd/yy for dates, this is potentially confusing for other folk who use dd/mm/yy.  My suggestion is to use 3 letters to designate the month, eg; 16 May 08.

    Similarly, it might be clearer to indicate "1213-40L" as: '12h 13m 40s Local Zone Time'.

    I hope you will eventually provide the solution in step by step form, to assist any who may be struggling with any part of the calculations.

    Please feel encouraged to continue.

    ".. was wondering if the members of the board
    would like some real-life sights to work out?"

    Yes!



    On Fri, May 16, 2008 at 5:58 PM, Anabasis <jcaoy@yahoo.com> wrote:

    Hello Navigators,

    I am currently on a ship and was wondering if the members of the board
    would
     like some real-life sights to work out?  I will supply the data and
    then people
    can run the numbers using whatever method and post results.

    Here is one from today, and it's a simple LAN problem.

    A ship is adrift near the island of Saipan, in the north Pacific.  The
    noon position
    is Lat 15-14'N and Long is 145-40'E on 5/16/08 (ZD -10)

    A) Calculate time of LAN, Az of the sun, and approximate Hc.

    A sight of the sun (LL) is observed at 1213-40L. Sextant altitude was
    85-59.0'.  Height of eye was 106 ft, IE is 0.8' off the arc.  Temp was
    93 deg F Barometer was 1012 MB.

    B) Determine Latitude by LAN.

    JCA



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