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    Silicon Sea: Leg 88
    From: Dan Hogan
    Date: 2003 Jun 25, 06:29 -0700

    ATTN:
    
    I am going sailing for a few weeks so the next Leg of Silicon Sea will not be
    posted until after mid-August.
    
    Cheers
    -Dan-
    **********************CUT HERE******************************************
    
    NOTE: Since we are close to home port arrival for Silicon Sea, the
    remaining celestial problems will use the 2002 Nautical Almanac.
    
    Chart(s): Plotting Sheets
    
    Sight Reduction and
    Dead-Reckoning problem     Leg 88  062503   Test your knowledge!
    ----------------------     ------  ------   --------------------
    We are headed for Mid-Ocean Point 1 (MOP1) (40d 00.0'N  155d 00.0'W).
    
    On 09/09/2002 {at} 03:30:20UT our DR position was(34d 10.4'N  150d 20.2'W.
    TC 327.4d, Speed 10 Kts, Drift 0.4 Kts, Set 273.0d. Var 15dE, Dev 1dW.
    
    1)   After 39Hours, what is the DR position?
    --  ----------------------------------------
    
    2)  What is the Zone Time(ZT) and date of this DR position?
    --  -------------------------------------------------------
    
    Since the sky is a solid overcast, we were not able to take any
    celestial sights. We decide to alter course for Mid Ocean Point 2
    (MOP 2) (45d 00.0'N  118d 15.1'W).
    
    3)  What is the TC and Dist to MOP 2?
    --  ---------------------------------
    
    Var 11.0dE, Dev 1.5dW, Current Drift 0.4 Kts, Set 120d. Speed 10 Kts.
    
    4)  What is the Compass Course(CC)/Course-to-Steer to MOP 2
        (45d 00.0'N  118d 15.1'W)?
    --  --------------------------------------------------------
    
    On this same day at a DR position of (39d 46.1'N  153d 54.8'W) at
    12:12:34ZT we manage a quick sight of the SUN. Var 11.0dE, Dev 1.5dW
    
          SUN LL    Hs 54d 48.1'
    
    5)  What is the Estimated Latitude line of this Sight?
    --  ---------------------------------------------------
    
    At 05:10:21UT 11/09/2002 we manage a sight of an unknown body through a break
    in th cloud cover.
    
        Bearing by Hand Compass 266.4d, appearing to be a magnitude 0.1.
    
                    Hs 33d 45.0'
    
    6)   What is the Name of this Body?
    --  -------------------------------
    
    Using the earlier SUN sight and this Body sight for a running FIX.
    
    7)  What is the Running FIX(RFIX) position?
    --  -------------------------------------------------------------
    
    NOTE:
    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 -  Smith_Peter{at}emc.com
            Mike Wescott - wescott_mike{at}emc.com
            Tony Capiello - cappiello_ar---.net
            Richard Berkowitz - richdberko---.com
            Dan Hogan - dhhogan1---.net
    
    
    

       
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