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    Silicon Sea: Leg 66
    From: Dan Hogan
    Date: 2000 Jun 14, 6:22 PM

    Chart(s): Plotting Sheet
    Sight Reduction and
    Dead-Reckoning problem     Leg 66  061400   Test your knowledge!
    ----------------------     ------  ------   --------------------
    Our Last FIX position was 11/05/2000 {at} 20:21:10UT (4d 00.0'S  31d 00,1'W).
    Our destination is a Mid-Ocean Waypoint at (00d 00.0'N  30d 00.0'W). The
    current is Set 265d, Drift 0.8 Kts. Speed 10.5 Kts, Var 21dW, Dev 0.0d.
    1)  What is the Compass Course(CC)/Course-to-Steer for the MOP?
            at (00d 00.0's  30d 00.0'W)?
    --  -------------------------------------------------------------
    2)  What is our Estimated Time of Arrival (ETA) at the MOP?
        In local Zone Time(ZT)
            In Universal Time(UT)
    --  -------------------------------------------------------------
    Tradition has it that when crossing the Equator, the Shellback initiation
    place at Noon(LAN) after crossing the Equator. Use the initial data.
    3)  What is the DR position at Local Apparent Noon(LAN) on this day?
    --  ----------------------------------------------------------------
    The Navigator takes a Noon Sight at the start the Shellback ceremony. And
    gets the following:
            Sun LL   11:53:58ZT   Hs 73d 54.2'
    4)  What is the Latitude at Local Apparent Noon?
        What is the Azimuth(Zn) of the Sun?
    --  --------------------------------------------
    5)  What is the TC and Distance to Barbados(13d 10.0'N  59d 20.0'W)
        from the Noon Sight estimated position?
    --  ---------------------------------------------------------------
    The Pilot Chart of The North Atlantic Ocean indicates Var 19.0dW, Dev is
    1.5dE. Speed 10.5Kts. Current Drift 1.0Kts, Set 285d.
    6)  What is the Compass Course(CC)/Course-to-Steer for Barbados?
    --  ------------------------------------------------------------
    7)  What is the estimated Time Enroute to Barbados
        from our LAN estimated position??
    --  -----------------------------------------------
    Lat & Lo = XXd XX.X', Date=DD/MM/YY, HE 9 Feet, Index correction
    -2.5', Time hh:mm:ss in UT,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{at}mtrs x 2.07; Nmi = SQRT HE{at}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 soon!
    Good Navigating!
       -=The Navigation List Working Group=-
            Peter Smith  - PSmith{at}IMPS0014.US.DG.COM
            John Simmonds- johnsimmo---.com
            Jim Manzari  - manzari{at}bluewin.ch
            Dan Hogan    - dhhogan{at}nav.cnchost.com
    Dan Hogan
    NAV-L Web Page: http://nav.cnchost.com

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