
Chart(s): Plotting Sheet

Sight Reduction and
Dead-Reckoning problem     Leg 74  061401   Test your knowledge!
----------------------     ------  ------   --------------------

Our last Running FIX(13d 37.8'N  68d 10.5'W) 16:30:29UT @ 01/06/2001.
We were headed for Aruba Gap(13d 50.0'N  70d 00.0'W).

On 02/06/2001 @ 06:46:28UT and at 107.7 Nmi from our RFIX we made a course
change at the Aruba Gap (13d 50.0'N 70d 00.0'W) waypoint. Our destination is
Cristobal, Panama(09d 23.0'N 79d 55.0'W). We are anticipating a transit of the
Panama Canal.

Var 8.0dW, Dev 1.0dE . Current Set 275.0d Drift 1.5 Kts. Speed 10.4Kts.


1) What is the the TC and Distance from Aruba Gap(13d 50.0'N 70d 00.0'W)
   to Crsitobal, Panama(09d 23.0'N 79d 55.0'W)?
-- ---------------------------------------------------------------------

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

Since our turn at Aruba Gap(13d 50.0'N  70d 00.0'W)We have been sailing in a
steady wind and clear skys.

At 05:16:28ZT @ 04/06/2001 we take some sights.
Speed 10.4 Kts, TC 245.5d.

3)  What is the 05:16:28ZT DR position?
--  -----------------------------------

We take the following sights:

    Body            UT/GMT          Hs

   Fomalhaut       10:17:22        47d 14.7'
   Deneb           10:17:56        51d 52.0'
   Altair          10:18:00        59d 18.2'
   Vega            10:18:46        37d 34.3'
   Venus           10:19:33        33d 20.0'


4)  What is the position FIX?
--  -------------------------

Speed 10.0 Kts. Var 5dW, Dev 1.5dE. Current Set 100.0d Drift 0.7 Kts.

5)  What is the TC and Distance to Cristobal(09d 23.0'N 79d 55.0'W)
    from the FIX position?
--  ----------------------------------------------------------------

6)  What is the ZT and Date of our ETA at the Cristobal waypoint
    (09d 23.0'N  079d 55.0'W)?
--  ------------------------------------------------------------

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@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     - Smith_Peter@EMC.COM
        John Simmonds   - johnsimmo@dingoblue.net.au
        David Weilacher - daveweilacher@earthlink.net
        Tony Cappiello  - cappiello@kearfott.com
        Frank Norris    - NORRIS_FRANKLIN_H@LILLY.COM
        Sam Chan        - schan@socal.rr.com
        Dan Hogan       - dhhogan@veriomail.com


