Chart(s): Plotting Sheets

Sight Reduction and                 Rev.
Dead-Reckoning problem     Leg 82  121001   Test your knowledge!
----------------------     ------  ------   --------------------

Our last position FIX was (11d 29.8'N  132d  29.5'W) 11/07/2001 @ 03:40:15UT.
We are bound for a landfall at Hawaii(19d 30.0'N  154d 45.0'W). Var 10.0dE
Dev 1.0dE; Current Drift 0.7 Kts Set 285d. Speed 9.7 Kts.

1)  What is the Compass Course(CC)/Course-to-Steer for our Hawaiian
    landfall point?
--  ---------------------------------------------------------------

2)  Based on the available information, what is the anticipated
    Speed Made Good(SMG) to the Hawaii waypoint?
--  -----------------------------------------------------------

The sky has been overcast for days. we have been unable to get a sight.
Var 10.0dE Dev 1.0dE. Speed 10.4 Kts. TC

Since the last FIX(11d 29.8'N  132d 29.5'W) 11/07/2001 @ 03:40:15UT,
navigating only on dead-reckoning having sailed a total of 1170.0 Nmi.
We take a SUN LL sight:

    DATE          UT/GMT        Hs

    15/07/2001    20:10:35      61d 20.6'

 3)  What is the DR position?
--  ------------------------

|Current Drift 0.7 Kts, Set 285.0d.

4)  What is the Speed Made Good(SMG) to this DR?
    What is the Compass Course(CCMG) this DR?
--  ---------------------------------------------------

At 01:44:36UT that same day we take another SUN LL sight. Use your plotted
True Course(TC) and Speed 10.2 Kts:

    Hs 40d 44.1'

5)  What is the Zn bearing of the SUN at the above sight?
--  -----------------------------------------------------

6)  What is the RFIX position?
--  -------------------------

7)  From our DR position, what is the Distance Off and True direction of
    the Running FIX?
--  --------------------------------------------------------------------

8)  What is the TC and Distance to the Hawaii landfall point at
    (19d 30.0'N  154d 45.0'W) from the FIX?:

    You should try at least two of the methods.

    On a Great Circle?
    On a Rhumb Line?
    On Mid-Latitude Sailing?
    On Mercator Sailing?
--  -----------------------------------------------------------

8a) As an aside try calculating from the RFIX to Sydney
    (33d 50.0'S  151d 20.0'E).
--  ---------------------------------------------------

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(Dead-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
        Tony Cappiello  - cappiello@kearfott.com
        Frank Norris    - NORRIS_FRANKLIN_H@LILLY.COM
        Sam Chan        - schan@socal.rr.com
        Mike Wescott    - wescott_mike@EMC.COM
        Dan Hogan       - dhhogan@veriomail.com


