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    Re: Silicon Sea: Leg 71
    From: Dan Hogan
    Date: 2001 May 12, 12:52 EDT

    On 11 May 2001, at 21:33, Sam Chan wrote:
    > Here is what I have.
    [Snip]
    >
    > > 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
    OK
    > > 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.
    Right
    > > 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.
    OK
    > >
    > > 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
    OK
    > >
    > > 5)  What is the Compass Course(CC)/Course-to-Steer for Aruba Gap?
    > > --  -------------------------------------------------------------
    > >
    > Course is 286.6C
    OK
    > > 6)  What is the time enroute to Aruba Gap?
    > > --  --------------------------------------
    > {at}XXX.XXX3kts, time enroute is 54h 03m
    OK
    > > 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.
    OK
    {Snip Leg Ending]
    Dan Hogan
    dhhogan{at}XXX.XXX
    

       
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