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    Silicon Sea: Leg 76
    From: Dan Hogan
    Date: 2001 Jul 05, 7:16 AM

    Chart(s): Plotting Sheets
    
    Sight Reduction and
    Dead-Reckoning problem     Leg 76  050701   Test your knowledge!
    ----------------------     ------  ------   --------------------
    
    We arrived on the Caribbean side of the Panama Canal on 04/06/2001. It is now
    17/06/2001 and we have finally arrived at the Pacific side at Balboa. Since
    it is a Sunday and we choose not to pay overtime, we motor the Balboa Yacht
    Club. The initiation fee is $25.00 and mooring fee is $00.50 per each
    complete foot per night. We spend two nights while we get our customs and
    port clearances.
    
    We then motor to the Isla Flamenco and anchor at(08d 55.2'N 79d 31.6'W) to do
    the final trip planning, servicing, and provisioning the boat. We will motor
    from our anchorage to abeam the Light at Isla San Jose(08d 10.5'N 079d
    15.0'W). Speed 8.3 Kts. Our departure is planned for sunrise on 24/06/2001.
    
    1)  What is the Zone Time(ZT) of sunrise at our anchorage?
        What is the UT/GMT time of Sunrise?
    --  ------------------------------------------------------
    
    2) What is the TC and Distance  from Our anchorage(08d 55.2'N 079d 31.6'W)
       to abeam of Isla San Jose Light(08d 10.5'N 079d 15.0'W)?
    -- -----------------------------------------------------------------------
    
    It is late in the season and the North Pacific storms are beginning so we
    elect to bypass the Galapagos Islands. We will follow the recommendations in
    Ocean Passages For The World and in World Cruising Routes and on departing
    Isla San Jose Light(08d 10.5'N  79d 15.0'W) we will head for a Mid-Ocean
    Point(MOP) at (03d 00.0'N  110d 00.0'W).
    
    
    3) What is the TC and Distance to the MOP at (03d 00.0'N  110d 00.0'W)
       from Isla San Jose Light(08d 10.5'N  79d 15.0'W)?
    -- ------------------------------------------------------------------
    
    >From the MOP(03d 00.0'N 110d 00.0'W) we head to make landfall on the
    Southwest coast of Hawaii(19d 30.0'N 154d 45.0'W). We have two alteratives
    depending on current and weather, either a Great Circle Course or the Rhumb-
    Line course.
    
    4)  Calculate the Rhumb Line TC and Distance to landfall.
        Calculate the Great Circle initial course and Distance to landfall.
    --  -------------------------------------------------------------------
    
    5) To the nearest tenth of a day, what are the total days enroute from our
       anchorage at Isla Flamenco to the Southwest coast of Hawaii as our plan is
       layed out? Sailing Speed 9.5 Kts, motoring Speed is 8.3 Kts:
    
        Isla Flamenco (08d 55.2'N 79d 31.6'W)
        Isla San Jose Light(08d 10.5'N 079d 15.0'W)
        Mid-Ocean Point(MOP) at (03d 00.0'N  110d 00.0'W)
        Southwest coast of Hawaii(19d 30.0'N 154d 45.0'W)
    -- ------------------------------------------------------------------------
    
    Having a 6 person crew and water consumption at 1.5 US Gal/day per person.
    
    6)  What is the expected water consumption for the trip to Hawaii?
    --  --------------------------------------------------------------
    
    7) Estimating 3lbs of food per day per person what is the total weight
       in food for the trip?
    -- -------------------------------------------------------------------
    
    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
            John Simmonds   - johnsimmo{at}dingoblue.net.au
            David Weilacher - daveweilacher---.net
            Tony Cappiello  - cappiello{at}kearfott.com
            Frank Norris    - NORRIS_FRANKLIN_H{at}LILLY.COM
            Sam Chan        - schan{at}socal.rr.com
            Dan Hogan       - dhhogan{at}veriomail.com
    
    Dan Hogan WA6PBY
    C27 "Gacha"
    dhhogan{at}verimail.com
    Nav-L Page: http://www.wa6pby.com
    

       
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