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    Silicon Sea: Leg 37
    From: Dan Hogan
    Date: 1997 Dec 27, 11:19 PM

    Chart(s): Plotting Sheet
    
    Sight Reduction and
    Dead-Reckoning problem     Leg 37  122697   Test your knowledge!
    ----------------------     ------  ------   --------------------
    
    We have been sailing under a solid overcast. Our DR position is
    12d 40.9'S  98d 01.6'E, 07/10/1996 {at} 13:44:00GMT. The TC is 122.7d,
    Var 3dW, Dev 4dW. Current Set 030d Drift 8 Kts. Wind is 15 Kts from 090d.
    Speed is 10 Kts.
    
    1)  What is the TC and Dist to Cocos/Keeling Island(12d 02.0'S
         97d 00.0'E)?
    --  ----------------------------------------------------------
    
    It appears that we have missed the island. Taking the consideration
    of weather and information from our Pilot Chart of The Indian Ocean
    for July. We plot a course for our next waypoint, Cape Leeuwin, Australia.
    (34d 15.0'S  116 06.0'E)
    
    2)  What is the TC and Dist to Cape Leeuwin?
    --  ----------------------------------------
    
    3)  What is the Compass course to Steer for Cape Leeuwin?
    --  -----------------------------------------------------
    
    4)  What is the Speed Made Good on this course?
    --  -------------------------------------------
    
    We log our turn to the new course at 19:00:00 of 07/10/96. We run
    into a period of intermittant rain showers and poor visibilty.
    
    5)  Using the speed made good of Q4, what is the Estimated Position
        (EP) at 12:15:00 {at} 7/14/96?
    --  ---------------------------------------------------------------
    
    Just after plotting our position the Sun peeks out through a cloud
    and we grab a quick sight.
    
    	Body	Hs  		Zone Time
    
    	SunLL	53d 20.7'	12:21:28
    	
    
    6)  What is the LOP that this sight provides?
    --  -----------------------------------------
    
    7)  What is the Azimuth(Zn) of the Sun?
    --  -----------------------------------
    
    8)  What is the plotted latitude?
    --  -----------------------------
    
    Note:
    Lat & Lo = XXd XX.X', Date=DD/MM/YY, HE 8 Feet, Index correction -.2', Time
    hh:mm:ss in UTC/GMT. Silicon Sea is a medium displacement sailing vessel, 40
    Feet LOA. 38 Feet LWL; Cutter rigged. Looks a lot like a Mason. Can tack to
    45d. Dist to Horizon: Nmi = SQRT HE{at}mtrs x 2.07; Nmi = SQRT HE{at}ft x
    1.17. Water Tank = 60 gal(Imp.). Fuel Tanks = 90 gal (Imp.). Fuel
    consumption .450 gal/Hr at 8.3 Kts.
    
    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  - psmith{at}wellspring.us.dg.com
            Ron Legere   - ronald.legere{at}yale.edu
            Tony Severdia- anthonys---.net
            Wes Murfin   - wmurfin{at}onslowonline.net (Cartographer)
            John Simmonds- mobi{at}netconnect.com.au
            Dan Hogan    - dhhogan{at}lightside.com
    
    *****************************ANSWERS************************************
    
    1) TC= 302.7d
       Dist= 72 mi
    
    2) TC= 125.4
       Dist= 1197.3 mi
    
    3) CC= 103.2d
    
    4) SMG= 2.5 Kts
    
    5) EP= 14d 50.2'S  101d 07.7'E
    
    6) LOP= Latitude line/Speed Line
    
    7) Az= 360d
    
    8) Lat= 14d 49.1'SChart(s): Plotting Sheet
    
    Sight Reduction and
    Dead-Reckoning problem     Leg 37  122697   Test your knowledge!
    ----------------------     ------  ------   --------------------
    
    We have been sailing under a solid overcast. Our DR position is
    12d 40.9'S  98d 01.6'E, 07/10/1996 {at} 13:44:00GMT. The TC is 122.7d,
    Var 3dW, Dev 4dW. Current Set 030d Drift 8 Kts. Wind is 15 Kts from 090d.
    Speed is 10 Kts.
    
    1)  What is the TC and Dist to Cocos/Keeling Island(12d 02.0'S
         97d 00.0'E)?
    --  ----------------------------------------------------------
    
    It appears that we have missed the island. Taking the consideration
    of weather and information from our Pilot Chart of The Indian Ocean
    for July. We plot a course for our next waypoint, Cape Leeuwin, Australia.
    (34d 15.0'S  116 06.0'E)
    
    2)  What is the TC and Dist to Cape Leeuwin?
    --  ----------------------------------------
    
    3)  What is the Compass course to Steer for Cape Leeuwin?
    --  -----------------------------------------------------
    
    4)  What is the Speed Made Good on this course?
    --  -------------------------------------------
    
    We log our turn to the new course at 19:00:00 of 07/10/96. We run
    into a period of intermittant rain showers and poor visibilty.
    
    5)  Using the speed made good of Q4, what is the Estimated Position
        (EP) at 12:15:00 {at} 7/14/96?
    --  ---------------------------------------------------------------
    
    Just after plotting our position the Sun peeks out through a cloud
    and we grab a quick sight.
    
    	Body	Hs  		Zone Time
    
    	SunLL	53d 20.7'	12:21:28
    	
    
    6)  What is the LOP that this sight provides?
    --  -----------------------------------------
    
    7)  What is the Azimuth(Zn) of the Sun?
    --  -----------------------------------
    
    8)  What is the plotted latitude?
    --  -----------------------------
    
    Note:
    Lat & Lo = XXd XX.X', Date=DD/MM/YY, HE 8 Feet, Index correction -.2', Time
    hh:mm:ss in UTC/GMT. Silicon Sea is a medium displacement sailing vessel, 40
    Feet LOA. 38 Feet LWL; Cutter rigged. Looks a lot like a Mason. Can tack to
    45d. Dist to Horizon: Nmi = SQRT HE{at}mtrs x 2.07; Nmi = SQRT HE{at}ft x
    1.17. Water Tank = 60 gal(Imp.). Fuel Tanks = 90 gal (Imp.). Fuel
    consumption .450 gal/Hr at 8.3 Kts.
    
    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  - psmith{at}wellspring.us.dg.com
            Ron Legere   - ronald.legere{at}yale.edu
            Tony Severdia- anthonys---.net
            Wes Murfin   - wmurfin{at}onslowonline.net (Cartographer)
            John Simmonds- mobi{at}netconnect.com.au
            Dan Hogan    - dhhogan{at}lightside.com
    
    
    Dan Hogan WA6PBY
    "Gacha" Catalina 27
    (1)dhhogan{at}lightside.com
    (2)dhhogan{at}concentric.net
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