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    Silicon Sea: Leg 50
    From: Dan Hogan
    Date: 1999 Mar 30, 13:10 EST

    Chart(s): Plotting Sheet / any Atlas
    Sun Sight &
    Dead-Reckoning problem     Leg 50  033099   Test your knowledge!
    ----------------------     ------  ------   --------------------
    Last FIX position (35d 52.0'S  170d 48.4'E) 09:05:22 {at}XXX.XXX
    TC 150.8d, speed 9.4 Kts. Var 20dE, Dev 3dE. We are sailing under a
    solid low overcast. At 0800ZT 20/02/1999 we have land to port.
    1)  What is the DR position at 0800ZT?
    --  ----------------------------------
    At 13:45:00ZT the same day we manage a quick shot of the lower limb of
    the Sun.
        Hs 60d 00.2'
    2)  What is the Sun's Zn?
    --  ---------------------
    At 18:10:10 me manage another lower limb Sun sight.
        Hs: 12d 54.4'
    3)  What is the Running Fix position from the previous Sun sight?
    --  ------------------------------------------------------------
    We set a course to a point(40d 00.0'S  174d 15.0'E) that is of off the
    Mt. Egmount headland. Var 20dE, Dev 3dE, Current set 15d, drift 15 Kts
    per day. We are making 10 Kts close hauled on a port tack.
    4)  What is the TC and Dist. to this point?
    --  ---------------------------------------
    5)  What is the Compass Course(CC)/Course-to-Steer?
    --  -----------------------------------------------
    6)  What is our Estimated Time of Arrival at the waypoint?
    --  ------------------------------------------------------
    7)  What is the time of Sunset at the(40d 00.0'S  174d 15.0'E)
        waypoint?
    --  ----------------------------------------------------------
    NOTE:
    Lat & Lo = XXd XX.X', Date=DD/MM/YY, HE 9 Feet, Index correction
    -2.5', Time hh:mm:ss in UTC/GMT,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}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{at}XXX.XXX
            John Simmonds- mobi{at}XXX.XXX
            Jim Manzari  - manzari{at}XXX.XXX
            Dan Hogan    - dhhogan{at}XXX.XXX
    
    Dan Hogan WA6PBY
    dhhogan{at}XXX.XXX
    Catalina 27 "GACHA"
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