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    Silicon Sea: Leg 79
    From: Dan Hogan
    Date: 2001 Sep 17, 7:38 AM

    Chart(s): Plotting Sheets
    
    Sight Reduction and
    Dead-Reckoning problem     Leg 79  091701   Test your knowledge!
    ----------------------     ------  ------   --------------------
    
    Our last FIX position was (03d 00.00'N  082d 00.0'W) {at} 10:51:11UT {at}
    26/06/2001. We are sailing toward MOP1(03d 00.0'N  110d 00.0'W) where
    we will turn and head for Hawaii.
    
    At a Log distance traveled of 710.5 Nmi from the FIX position. TC 270.0d,
    Speed 10.0 Kts, we determine that we have entered the Equatorial Counter
    Current.
    
    1)  What is the DR position on entering the Equatorial Counter Current?
    --  -------------------------------------------------------------------
    
    On the morning of 30/06/2001 we manage the following sights:
    
            Body            UT/GMT          Hs
    
            Fomalhaut       11:53:00        54d 01.8'
            Deneb           11:55:10        30d 03.8'
            Altair          11:57:20        27d 35.1'
            Saturn          11:59:05        23d 17.4'
            Venus           12:04:11        38d 50.8'
    
    2)  What is the DR position at the time of the Fomalhaut sight?
    --  -----------------------------------------------------------
    
    3)  What is the position FIX?
    --  -------------------------
    
    TC 270.0d, Speed 10.0 Kts, Current Drift 1.0 Kts, Set 280.0d. Var 2.0dE,
    Dev 1.5dE.
    
    4)  What is the Compass Course(CC)/Course-to-Steer to MOP1(03d 00.0'N
        110d 00.0'W) from the FIX position?
    --  -----------------------------------------------------------------
    
    5)  What is the distance to MOP1(03d 00.0'N  110d 00.0'W)?
    --  ------------------------------------------------------
    
    With all times rounded to the nearest whole minute.
    
    6)  What is the UT day and date of our ETA at MOP1?
        What is the Zone Time(ZT) and date of our ETA at MOP1?
    --  ------------------------------------------------------
    
    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
            Tony Cappiello  - cappiello{at}kearfott.com
            Frank Norris    - NORRIS_FRANKLIN_H{at}LILLY.COM
            Sam Chan        - schan{at}socal.rr.com
            Mike Wescott    - wescott_mike{at}EMC.COM
            Dan Hogan       - dhhogan{at}veriomail.com
    
    Dan Hogan
    dhhogan{at}verionmail.com
    

       
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