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    Re: Silicon Sea: Leg 71
    From: Sam Chan
    Date: 2001 May 12, 00:33 EDT

    Here is what I have.
    Sam Chan
    ----- Original Message -----
    From: "Dan Hogan" <dhhogan{at}XXX.XXX>
    To: <NAVIGATION-L{at}XXX.XXX>
    Sent: Wednesday, May 09, 2001 6:49 AM
    Subject: Silicon Sea: Leg 71
    > Chart(s): Plotting Sheets
    >
    > Sight Reduction and
    > Dead-Reckoning problem     Leg 71  050801   Test your knowledge!
    > ----------------------     ------  ------   --------------------
    >
    > At 18:27:00ZT {at}XXX.XXX6'N
    > 61d 30.1'W) as we passed between the Lessor Antilles islands of St, Lucia
    and
    > St. Vincent. We are bound for, Mid Ocean Point(MOP1)(12d 30.0'N  70d
    00.0'W),
    > in water of more than 1000 mtrs North of Aruba. This is to avoid
    unfavorable
    > currents along the coast.
    > Dev 1.5dE, Var 12dW. Speed is 8.7 Kts, Current Drift 0.7Kts, Set 270.0d.
    > TC 263.7d.
    >
    > 1)  At the log reading of 89.6Nmi, what is the DR position?
    > --  -------------------------------------------------------
    Using Mercator sailing, DR is 13d 15.8'N 63d 08.0'W
    >
    > 2)  At the DR position what is the celestial phenomena that is starting
    >     at this DR Zone Time(ZT)?
    > --  -------------------------------------------------------------------
    >
    For 89.6 nm {at}XXX.XXX Starting at 291829Q May 2001,
    we are at the DR in (1) at 300447Q May 2001. This is near the start of
    nautical twlight.
    > NOTE: Sextant Index correction is on the arc 1.5d.
    >
    > We then take the following sights:
    >
    >     Body        UT          Hs
    >
    >     Fomalhaut   08:50:10    40d 54.7'
    >     Polaris     08:50:55    13d 17.3'
    >     Deneb       08:51:05    56d 56.3'
    >     Mars        08:52:03    25d 35.0'
    >     Venus       08:53:22    28d 13.8'
    >     Vega        08:53:45    45d 55.6'
    >
    > 3)  What is the FIX position?
    > --  -------------------------
    Fix is at 13d 01.4'N 61d 28.8'W.
    >
    > The navigator has been examining nautical chart INT 400. It shows an area
    > labeled the Aruba Gap (13d 50.0'N  70d 00.0'W) with a favorable current of
    > 1.15 Kts. He decides to make for this waypoint. Var 12dW, Dev 1dE.
    > Current Set 275d Drift 0.8 Kts. Speed 9.3 Kts.
    >
    > 4)   What is the TC and Dist from our FIX to the Aruba Gap
    >      (13d 50.0'N  70d 00.0'W)
    > --  ------------------------------------------------------
    Using Mercator sailing, TC = 275.6, D=502.6 NM
    >
    > 5)  What is the Compass Course(CC)/Course-to-Steer for Aruba Gap?
    > --  -------------------------------------------------------------
    >
    Course is 286.6C
    > 6)  What is the time enroute to Aruba Gap?
    > --  --------------------------------------
    {at}XXX.XXX3kts, time enroute is 54h 03m
    >
    > 7)  What is the anticipated Speed Made Good(SMG) to Aruba Gap?
    > --  ----------------------------------------------------------
    Set of the current is very close to the TC. SMG is 10Kts.
    >
    > NOTE:
    > Lat & Lo = XXd XX.X', Date=DD/MM/YY, HE 9 Feet, Index correction
    > -1.5', 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(Dead-Reckoning)=position
    > by sailings, EP(Estimated Position)=DR+current affect. Dist to
    > Horizon: 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  -   Smith_Peter{at}XXX.XXX
    >         John Simmonds-   johnsimmo{at}XXX.XXX
    >         David Weilacher- daveweilacher{at}XXX.XXX
    >         Tony Cappiello-  cappiello{at}XXX.XXX
    >         Frank Norris-    NORRIS_FRANKLIN_H{at}XXX.XXX
    >         Dan Hogan    -   dhhogan{at}XXX.XXX
    >
    >
    > Dan Hogan
    > dhhogan{at}XXX.XXX
    >
    

       
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