Chart(s): Plotting Sheet, *1998 Nautical Almanac*

NOTE: In order provide problems that may be worked with a current
      Nautical Almanac, The Silicon Sea Cruise dates will reflect
      the current *year*. This is the same cruise continuing, but
      the cruise YEAR will be kept in step with our actual year.

Sight Reduction and
Dead-Reckoning problem     Leg 39  XXXXXX   Test your knowledge!
----------------------     ------  ------   --------------------

On 14/07/1998 @ 18:21:28ZT our DR position was 15d 39.4'S  101d
40.8'E. TC 147d, Speed 10Kts. Var 4W, Dev 4W. Wind Force 6 from
260d. Sky was a low overcast with scudding clouds.

On 16/07/1998GMT we manage sights of the following bodies:

 Body                GMT              Hs             Zn

 Avior               22:38:33         13d 52.2'      149.5d
 Fomalhaut           22:40:13         55d 55.8'      251.9d
 Sirius              22:55:22         19d 56.7'      100.1d

1) What is the DR position at the time of the first sight?
-- -------------------------------------------------------

2)  Using the time of the first sight, what is the FIX position?
-- ------------------------------------------------------------

3)  What is the distance remaing to Cape Leeuwin?
    What is the TC calculated?
--  ---------------------------------------------

The Indian Ocean Pilot Chart for July in our area indicates a
current SET 175d, Drift 6 mi/day.

4)  What is the Compass Course to steer(CCts) to Cape Leewin
    based on our speed and base set TC and of 147.0d?
--  --------------------------------------------------------

5)  In practical navigation would it be necessary or desired to
    change the established TC based on the latest calculations
    for Q3?
--  -----------------------------------------------------------

6)  What is the estimated Speed Made Good(SMG) based on the
    current?
-- --------------------------------------------------------

7)  Based on the SMG and TC what is the DR position at 19/07/1998
     @ 11:00:00GMT?
--  --------------------------------------------------------------

8)  What celestial phenomenon is starting at our DR?
--  ------------------------------------------------

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@mtrs x
2.07; Nmi = SQRT HE@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@wellspring.us.dg.com
        Ron Legere   - ronald.legere@yale.edu
        Tony Severdia- anthonys@pacbell.net
        Wes Murfin   - wmurfin@onslowonline.net (Cartographer)
        John Simmonds- mobi@netconnect.com.au
        Jim Manzari  - manzari@bluewin.ch
        Buck Godwin  - bgodwin@newsguy.com (Archive Files)
        Dan Hogan    - dhhogan@lightside.com

