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    Re: Silicon Sea: Leg 83 Answers
    From: Dan Hogan
    Date: 2002 Sep 26, 18:17 -0700

    On 27 Sep 2002, at 9:05, Peter Fogg wrote:
    {Snip Navig data]
    > For the first segment  we are given, apart from the speed of 10 k, a
    > Current Set 095d, Drift 0.7 Kts. Yet the time above for the 140 nm run,
    > 14:00:00 Hrs, indicates the speed used was the 10 k rather than a lesser
    > speed
    > influenced by the contrary current, a SMG of about 9.3 k.It makes for
    > about an hour's difference. I don't understand this apparent inconsistancy.
    The problems are based on the DR. But, I have been known to mess up the
    Speed Made Good(SMG)is an after the fact result of the navig calculations.
    And are not used in the calculations.
    > The rest is minor -  Distance  10.4 / SpMdGd 9.4 = 1h 06m 23m, rather than
    > 01:06:54 Hrs, just as Distance  25.4 / SpMdGd 10.3 = 2h 27m 58s, rather than
    > 02:27:42 Hrs. Can imagine these small differences come about from the
    > calculator using internal data that is more precise than that displayed, which
    > is rounded to specification.
    Ther will be slight differences, excluding my goofs, depending on the
    techniques used for solving the problem.
    > Despite these whinges and moans, enjoy these Silicon Sea exercises greatly.
    > Long may they sail.

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