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    Silicon Sea II: Leg 54
    From: Dan Hogan
    Date: 1999 Jun 01, 7:40 PM

    Chart(s): Plotting Sheet
    Sight Reduction and
    Dead-Reckoning problem     Leg 54  060299   Test your knowledge!
    ----------------------     ------  ------   --------------------
    TC 96.9d, speed 9.4 Kts, Var 17dE dev 2.0dW., Current Drift 10 Kts/day.
    Set 175d. Our last FIX was(41d 59.9'S  178d 00.5'E) on 05/03/1999 @
    07:30:00GMT. We are bound for Trans Ocean Point 1(49d 00.0'S 100d
    00.0'W), to connect with the sailing route that will carry us across
    the Southern Ocean toward Cape Horn.
    1)  What is the Compass Course(CC)/Course-to-Steer?
    --  -----------------------------------------------
    Winds are at to Force 6. We have a solid cloud overcast of cumulus
    of bad weather. Wind has veered to 195d. Our speed is 10.3 Kts. We
    sail under these conditions for 6 days. At 09:01:23GMT we are able
    to take a quick sights of two bodies.
    2)  What is the DR position at 09:01:23GMT mark?
    --  ---------------------------------------------
    Var 25dE, Dev 2.5dW.
        Body       GMT          Hs
        Unknown    05:01:23     14d 53.0'   173.3d Steering Compass bearing
                                            Body of low brightness.
        Aldebaran  05:05:06     23d 17'
    3)  What is the unknown body?
    --  -------------------------
    4)  What is the FIX  position?
    --  --------------------------
    The wind backs to 180d, Force 4. Our Speed is 10.3 Kts. The Pilot Chart
    of The South Pacific Ocean for March shows the line of the maximum
    extent of Icebergs on our course at about (46d 00.0'S 135d 00.0'W). Var
    25dE Dev 2.0dW, Current Drift 9.6 Kts/day, Set 85d.
    5)  What is our Estimated Time of Arrival(ETA) at this point
         In GMT time and date?
         In ZT time and date?
    --  ---------------------------------------------------------
    6)  At the time of our position FIX, what is the distance to Trans
        Ocean Point 1(49d 00.0'S  170d 00.00'W)?
    --  --------------------------------------------------------------
    7)  At 10.3 Kts how many hours before we reach Trans Ocean Point 1?
    Lat & Lo = XXd XX.X', Date=DD/MM/YY, HE 9 Feet, Index correction
    -2.5', Time hh:mm:ss in UTC/GMT,unless otherwise stated. Silicon Sea II
    is a 34,000 lb(15.40t) displacement sailing vessel, 48' 3"(14.70m)
    LOA. 39' (12.00m) LWL; Cutter rigged. Can tack to 45d. Water Tanks =
    220 gal(1000 ltrs). Fuel Tanks = 155 gal(700 ltrs). Fuel consumption
    .675 gal/Hr at 8.5 Kts. DR(Ded-Reckoning)=position by sailings,
    EP(Estimated Position)=DR+current affect. Dist to Horizon: Nmi = SQRT
    HE@mtrs x 2.07; Nmi = SQRT HE@ft x 1.17.
    PLEASE respond with your results and thinking on these exercises to the
    NAVIGATION list at large. If you have questions or problems, A lot of
    folks on the list are knowledgeable and willing to help. Any questions
    or doubtful areas will be responded to promptly. Let us hear from you
    Good Navigating!
       -=The Navigation List Working Group=-
            Peter Smith  - PSmith@IMPS0014.US.DG.COM
            John Simmonds- mobi@netconnect.com.au
            Jim Manzari  - manzari@bluewin.ch
            Dan Hogan    - dhhogan@nav.cnchost.com
    Dan Hogan

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