Chart(s): Plotting Sheet

Sight Reduction and 
Dead-Reckoning problem     Leg 54  060299   Test your knowledge!
----------------------     ------  ------   --------------------

TC 96.9d, speed 9.4 Kts, Var 17dE dev 2.0dW., Current Drift 10 Kts/day.
Set 175d. Our last FIX was(41d 59.9'S  178d 00.5'E) on 05/03/1999 @ 
07:30:00GMT. We are bound for Trans Ocean Point 1(49d 00.0'S 100d 00.0'W), 
to connect with the sailing route that will carry us accross the Southern 
Ocean toward Cape Horn.


1)  What is the Compass Course(CC)/Course-to-Steer?
--  -----------------------------------------------

Winds are at to Force 6. We have a solid cloud overcast of cumulus 
of bad weather. Wind has veered to 195d. Our speed is 10.3 Kts. We 
sail under these conditions for 6 days. At 09:01:23GMT we are able 
to take a quick sights of two bodies.


2)  What is the DR position at 09:01:23GMT mark?
--  ---------------------------------------------

Var 25dE, Dev 2.5dW.

    Body       GMT          Hs
   
    Unknown    05:01:23     14d 53.0'   173.3d Steering Compass bearing
                                        Body of low brightness.
    Aldebaran  05:05:06     23d 17'

3)  What is the unknown body?
--  ------------------------- 
    
4)  What is the FIX  position?
--  --------------------------

The wind backs to 180d, Force 4. Our Speed is 10.3 Kts. The Pilot Chart
of The South Pacific Ocean for March shows the line of the maximum extent 
of Icebergs on our course at about (46d 00.0'S 135d 00.0'W). Var 25dE Dev
2.0dW, Current Drift 9.6 Kts/day, Set 85d.


5)  What is our Estimated Time of Arrival(ETA) at this point
     In GMT time and date?
     In ZT time and date?
--  ---------------------------------------------------------

6)  At the time of our position FIX, what is the distance to Trans 
    Ocean Point 1(49d 00.0'S  170d 00.00'W)?
--  --------------------------------------------------------------

7)  At 10.3 Kts how many hours before we reach Trans Ocean Point 1?
    ---------------------------------------------------------------


NOTE:
Lat & Lo = XXd XX.X', Date=DD/MM/YY, HE 9 Feet, Index correction
-2.5', Time hh:mm:ss in UTC/GMT,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@mtrs x 2.07; 
Nmi = SQRT HE@ft x 1.17. 

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@IMPS0014.US.DG.COM
        John Simmonds- mobi@netconnect.com.au
        Jim Manzari  - manzari@bluewin.ch
        Dan Hogan    - dhhogan@nav.cnchost.com
                

