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    Re: Silicon Sea: Leg 72 -NEW
    From: Sam Chan
    Date: 2001 May 25, 01:47 EDT

    Dan,
    Please check the compass bearings to the unknown bodies. They may be in
    error.
    Sam
    ----- Original Message -----
    From: "Dan Hogan" <dhhogan{at}XXX.XXX>
    To: <NAVIGATION-L{at}XXX.XXX>
    Sent: Wednesday, May 23, 2001 5:42 PM
    Subject: Silicon Sea: Leg 72 -NEW
    > This is a TOTAL and complete revision to Leg 72. You can delete the
    previous
    > issue.
    >
    > My apologies.
    > *************************
    > Chart(s): Plotting Sheet
    >
    > Sight Reduction and                Revised
    > Dead-Reckoning problem     Leg 72  052301   Test your knowledge!
    > ----------------------     ------  ------   --------------------
    >
    > Our Last position FIX was (13d 00.0'N  61d 30.1'W) at 08:50:10UT on
    > 30/05/2001. We are bound for a point on chart INT 401 marked as Aruba Gap
    > (13d 50.0'N 70d 00.0'W). Aruba Gap provides a favorable westerly current
    of
    > 1.5 Knts.
    >
    > We have had overcast skys and have missed some possible sights. The winds
    > have been fluky and we have had to tack several times since our last FIX
    > position.
    >
    >     Tack 1: CC 333.0d - 04Hrs {at}XXX.XXX5 Kts - Var 12dW Dev 1dE
    >     Tack 2: CC 242.0d - 11Hrs {at}XXX.XXX5dE
    >     Tack 3: CC 262.0d - 08Hrs {at}XXX.XXX5dE
    >     Tack 4: CC 307.0d - 10Hrs {at}XXX.XXX0dE
    >
    > 1)  What is the DR position at the end of the Tack 4?
    > --  -------------------------------------------------
    >
    > 2)  What is the DR position local Zone Time(ZT) and Date?
    >     What is the DR position GMT/UT time and Date?
    > --  -----------------------------------------------------
    >
    > 3)  From the DR position, what is the TC to Aruba Gap
    >     (13d 50.0'N  70d 00.0'W)?
    > --  -------------------------------------------------
    >
    > Our speed is 8.5 Kts, Var 10dW Dev 1.0dE. Current Drift 0.7 Kts Set 265.0d
    >
    > 4)  What is the Compass Course(CC)/Course-to-Steer for Aruba Gap
    >     from the DR position?
    > --  ------------------------------------------------------------
    >
    > The following morning the navigator see stars through breaks in the
    > clouds. He takes the following sights. Same data as for Q3 & Q4.
    >
    >     Body        ZT              Hs
    >
    >     UNKNOWN     05:39:00        13d 53.6' (Steering Compass Bearing
    351.7d)
    >     Mars        05:39:11        18d 14.5'
    >     UNKNOWN     05:40:03        54d 58.9' (Steering Compass Bearing
    329.3d)
    >     Vega        05:41:06        40d 10.3'
    >     Venus       05:43:33        35d 25.8'
    >
    > 5)  What is the FIX position?
    > --  -------------------------
    >
    > 6)  What are the names of the two unknown bodies?
    > --  ---------------------------------------------
    >
    > 7)  What is the TC and Distance to the Aruba Gap (13d 50.0'N  70d 00.0'W)
    >     waypoint from our FIX?
    > --  ---------------------------------------------------------------------
    >
    > 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}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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