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    Silicon Sea: Leg 67
    From: Dan Hogan
    Date: 2000 Jul 13, 09:42 EDT

    Chart(s): Plotting Sheets
    Sight Reduction and
    Dead-Reckoning problem     Leg 67  071300   Test your knowledge!
    ----------------------     ------  ------   --------------------
    Our last Estimated Position was our Noon sight(LAN) on 12/05/2000 @
    11:53:58ZT. We have crossed the Equator and celebrated the Shellback
    initiation ceremony with King Neptune. We are bound for the island of
    Barbados(13d 10.0'N  59d 20.0'W). TC 289.9d, Speed 10.5Kts, current Drift
    1.0Kts Set 285.0d.
    At evening we get the following sights:
            Body            Zone Time                       Hs
            Moon            18:30:00                        65d 55.3'
            Sirius          18:31:05                        40d 14.1'
            Betelgeuse      18:31:11                        31d 18.7'
            Capella         18:32:03                        16d 56.2'
            Spica           18:32:44                        35d 19.5'
            Dubhe           18:33:15                        29d 52.3'
    1)  What is the UTC of the FIX at 18:30:00ZT?
    --  ----------------------------------------
    2)  What is the  GHA Aries of the Moon at the time of the sight?
    --  -------------------------------------------------------------
    3)  What is the FIX position at the time of the Moon sight?
    --  -------------------------------------------------------
    Var 19dW. Dev 1.5dE Current Drift 1.0Kts Set 295.0d. TC 289.9d. Speed
    10.5Kts. Barbados(13d 10.0'N  59d 20.0'W).
    4)  What is the Compass Course(CC)/Course-to-Steer for Barbados
        from our FIX position?
    --  -------------------------------------------------------------
    5)  What is the True Course(TC) to Barbados?
    --  ----------------------------------------
    We travel for a Distance of 614.4 mi on our TC of at a speed of 10.5Kts.
    6)  What is the DR position?
    --  ------------------------
    7)   What is the Zone Date?
         What is the Zone Time(ZT)?
    --  ---------------------------
    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@XXX.XXX
    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@XXX.XXX
            John Simmonds- johnsimmo@XXX.XXX
            Jim Manzari  - manzari@XXX.XXX
            Dan Hogan    - dhhogan@XXX.XXX
    Dan Hogan
    NAV-L Web Page: http://nav.cnchost.com

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