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    Silicon Sea: Leg 74
    From: Dan Hogan
    Date: 2001 Jun 14, 7:05 AM

    Chart(s): Plotting Sheet
    Sight Reduction and
    Dead-Reckoning problem     Leg 74  061401   Test your knowledge!
    ----------------------     ------  ------   --------------------
    Our last Running FIX(13d 37.8'N  68d 10.5'W) 16:30:29UT @ 01/06/2001.
    We were headed for Aruba Gap(13d 50.0'N  70d 00.0'W).
    On 02/06/2001 @ 06:46:28UT and at 107.7 Nmi from our RFIX we made a course
    change at the Aruba Gap (13d 50.0'N 70d 00.0'W) waypoint. Our destination is
    Cristobal, Panama(09d 23.0'N 79d 55.0'W). We are anticipating a transit of the
    Panama Canal.
    Var 8.0dW, Dev 1.0dE . Current Set 275.0d Drift 1.5 Kts. Speed 10.4Kts.
    1) What is the the TC and Distance from Aruba Gap(13d 50.0'N 70d 00.0'W)
       to Cristobal, Panama(09d 23.0'N 79d 55.0'W)?
    -- ---------------------------------------------------------------------
    2)  What is the Compass Course(CC)/Course-to-Steer?
    --  -----------------------------------------------
    Since our turn at Aruba Gap(13d 50.0'N  70d 00.0'W)We have been sailing in a
    steady wind and clear skys.
    At 05:16:28ZT @ 04/06/2001 we take some sights.
    Speed 10.4 Kts, TC 245.5d.
    3)  What is the 05:16:28ZT DR position?
    --  -----------------------------------
    We take the following sights:
        Body            UT/GMT          Hs
        Fomalhaut       10:17:22        47d 14.7'
        Deneb           10:17:56        51d 52.0'
        Altair          10:18:00        59d 18.2'
        Vega            10:18:46        37d 34.3'
        Venus           10:19:33        33d 20.0'
    4)  What is the position FIX?
    --  -------------------------
    Speed 10.0 Kts. Var 5dW, Dev 1.5dE. Current Set 100.0d Drift 0.7 Kts.
    5)  What is the TC and Distance to Cristobal(09d 23.0'N 79d 55.0'W)
        from the FIX position?
    --  ----------------------------------------------------------------
    6)  What is the ZT and Date of our ETA at the Cristobal waypoint
        (09d 23.0'N  079d 55.0'W)?
    --  ------------------------------------------------------------
    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@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 soon!
    Good Navigating!
       -=The Navigation List Working Group=-
            Peter Smith     - Smith_Peter@EMC.COM
            John Simmonds   - johnsimmo@dingoblue.net.au
            David Weilacher - daveweilacher@earthlink.net
            Tony Cappiello  - cappiello@kearfott.com
            Frank Norris    - NORRIS_FRANKLIN_H@LILLY.COM
            Sam Chan        - schan@socal.rr.com
            Dan Hogan       - dhhogan@veriomail.com
    Dan Hogan WA6PBY
    C27 "Gacha"
    Nav-L Page: http://www.wa6pby.com

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