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NOTE to SS'rs:

It has been pointed out that I have taken too many short cuts in my
effort to ease my work on Silicon Sea. So back to basics. The
current data provided on a Pilot Chart is the average velocity in
miles per day. I will state them in either as "Pilot Chart 260d 8m"
or for a specific problem as "Set ddd, Drift .xx Kts/Hr."
**************************

Chart(s): Plotting Sheet

Sight Reduction and
Dead-Reckoning problem     Leg 38  033198   Test your knowledge!
----------------------     ------  ------   --------------------

On 14/07/1996 @ 12:21:28ZT our Lat was 14d 41.1'S, EP Lon was
101d 07.1'E. TC was 125.4, Speed 10 Kts, Var 4dW, Dev 4dW. Sky still
overcast. It was obvious that we had missed Cocos/Keeling Island(12d
02.0'S 97d 00.0'E).

1)  What is the TC for Cape Leeuwin(34d 15.0'S  115 06.0'E) from the
    Estimated Position(14d 41.1'S 101d 07.1'E)? we estimate current
    Set 260d Drift .33 Kts/Hr
--
-----------------------------------------------------------------

We continue on the TC to Cape Leeuwin. At 18:21:28ZT(Zone Time) we
take a sight of a bright body between a break in the clouds.

 Hs			 Compass Bearing
 58d 49.3'	 100.9d

2)  Excluding Current, what is the DR position to use for the Sight
    Reduction?
--  ----------------------------------------------------------------

3)  a) What Celestial Body is this?
    b) What its Zn?
--  -------------------------------

4)  Using the 12:21:28ZT Estimated Position and TC, the 18:21:28ZT
	Body LOP, what is the 18:21:28ZT DR?
-- ----------------------------------------------------------------

According to our Pilot Chart of The Indian Ocean for July, the
average *daily* current in our area is, 260d 8m.

5)  Based on the Pilot Chart data, what is our current estimated
    Speed Made Good(SMG) on our TC to Cape Leeuwin?
--  -------------------------------------------------------------

6)  What is the Compass Course to Steer?
    ------------------------------------

7)  At this SMG how many days(nearest tenth) is it until we reach
    Cape Leeuwin?
--  ------------------------------------------------------------

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
        Dan Hogan    - dhhogan@lightside.com
Dan Hogan WA6PBY
"Gacha" Catalina 27
(1) dhhogan@lightside.com
(2) dhhogan@concentric.net
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