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    Re: Leg 46
    From: Dan Hogan
    Date: 1999 Feb 07, 21:37 EST

    Hi Millard glad to see you back. You've been one of the steady
    contributors to Silicon Sea.
    > The answer of 70 days for problem #2 was arrived by the following method:
    > The rhumb line each leg was determined.
    >
    > Planning Routes--Port Jackson to Boston
    >
    > Port Jackson(Sydney) Departure--33d 50.8'S  151d 18.0'E
    > Tasman Sea Waypoint 1-----------34d 00.0'S  151d  40.0'E        20.5 nm
    > Tasman Sea Waypoint 2-----------38d 40.0'S  166d  45.0'E      783.5 nm
    > Destination N of Stephens Is.---40d 50.0'S  174d 00.0'E          360.0 nm
    > Wellington Departure Point------41d 30.0'E  175d 20.0'E            72.4 nm
    > Cape Horn-----------------------56d 04.0'S   67d 15.0'             4692
    > nm WPort Stanley, Falkland Is.------51d 40.0'S   57d 40.0'W          430
    > nm Mid-Atlantic Waypoint-----------00d 00.0'N   23d 00.0'W      3576.6 nm
    > Barbados------------------------13d 10.0'N   59d 20.0'W          2314.2
    > nm Cape Cod------------------------42d 10.0'N   70d 00.0'W	        1827.9
    > nm Boston--------------------------42d 20.0'N   70d 46.0'W
    > 35.6 nm
    >
    > Total    14,112.2 nm
    If there are two answers alike I am going to be very surprised. Foe tid
    long a distance a lot of differences will creep in depending on
    technique and method used.
    >
    > 14,112.2 divided by average speed of 8.4 kts  yields 1680.0238 hours
    > that divided by 24 gave 70.000992 hours.
    Any way you find doing the calculation say is fine . Because it fits in
    with other navigation problems I use "Daily distance = Speed in Kts x
    24Hrs(one day)". Then divide that into the total distance.
    > This answer is based on sailing time only and I did the problem as I
    > thought it was presented.  This in my opinion would only be estimate of
    > distance and time for planning.  I would assume the longer legs one might
    > sail the great circle, but I did not read the problem in that context.  On
    > the other hand the sailing of each leg might be longer due to winds and
    > currents, and therefore the overall distance may even be longer. I would
    > assume one would stop at some of these way points.  I know if I sailed
    > approximately 4700 miles I would like to get off the boat for a moment for
    > a little rum or beer.   :-)
    It's only a planning exercise. But there ain't a lot of beer stops
    between Wellington and Cape Horn ;^(
    Dan Hogan WA6PBY
    dhhogan{at}XXX.XXX
    Catalina 27 "GACHA"
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