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Here is what I have.
Sam Chan
----- Original Message -----
From: "Dan Hogan" <dhhogan@XXX.XXX>
To: <NAVIGATION-L@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 @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 @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?
> --  --------------------------------------
@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@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@XXX.XXX
>         John Simmonds-   johnsimmo@XXX.XXX
>         David Weilacher- daveweilacher@XXX.XXX
>         Tony Cappiello-  cappiello@XXX.XXX
>         Frank Norris-    NORRIS_FRANKLIN_H@XXX.XXX
>         Dan Hogan    -   dhhogan@XXX.XXX
>
>
> Dan Hogan
> dhhogan@XXX.XXX
>

   

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