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    Re: FW: Re: Chronometer Suggestions
    From: Peter Fogg
    Date: 2009 Jan 10, 19:03 +1100


    On Sat, Jan 10, 2009 at 18:31, <glapook---.net> wrote:
    And here is the simple answer. If, where he is sailing, he can
    tolerate a one minute of longitude error all he needs is a watch that
    is accurate within 4 seconds. If sailing in the middle of the ocean
    more than fifteen degrees of longitude away from any danger you can
    use a watch with a one hour error.

    Hmm.  The assumption that the purpose of position finding is to avoid danger may obscure a more important reason for the activity.  I propose that the main reason for deriving a position, particularly when well away from land, is to find out in what direction the destination lies.  Depending on how far away that destination (or waypoint) may be, an hour's worth of time error could make a great deal of difference to the correct heading.  And if the error was consistent, which it presumably would be, could lead to the poor sailor becoming altogether lost.

    Tell us you're pulling our leg, Gary ...
     


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