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Planning and
Dead-Reckoning problem     Leg 85  102202   Test your knowledge!
----------------------     ------  ------   --------------------

Silicon Sea spent a leisurely cruise sailing up the Hawaiian islands chain
from Hilo. There were was a stop at Honolulu for re-fitting and supplies.
We have arrived at Hanalei Bay, Kauai(22d 15.0'N  159d 31.0'N). On
08/30/2002 we are preparing to depart for San Pedro, California.

We will follow the traditional sailing route to Southern California from
Hawaii. By sailing north until we get above the Pacific High and then pick
up the prevailing Westerly winds and turn east to a point where we can head
toward Southern California.

    Planned Route:

    Hanalei Bay (22d 15.0'N  159d 31.0'W)
    Mid-Ocean Point 1(MOP1) (40d 00.0'N  155d 00.0'W)
    Mid-Ocean Point 2(MOP2) (45d 00.0'N  124d 00.0'N)
    Los Angeles Light (33d 42.5'N  118d 15.1'W)

1)  What is the total distance from Hanalei Bay to L.A. Light?
--  ----------------------------------------------------------

2)  Based on a Speed of 10 Kts how many days is it to L.A. Light?
--  -------------------------------------------------------------

The crew has 5 members. Water usage is estimated at 1.5 gal per man/day.

3)  Does Silicon Sea carry enough water for the voyage?
--  ---------------------------------------------------

4)  What is the TC from Hanalei Bay(22d 15.0'N  159d 31.0'W) to
    Mid-Ocean Point1(MOP1)(40d 00.0'N  155d 00.0'W)?
--  ----------------------------------------------------------

We depart our anchorage at Hanalei Bay(22d 15.0'N  159d 31.0'W) on
>05/09/2002 @ 22:36:40UT.

5)  What is the significance of the departure time?
--  -----------------------------------------------

>At 22:52:28UT we take a departure FIX of (22d 18.0'N  159d 30.0'W)

6)  What is the TC to MOP1(40d 00.0'N  155d 00.0'W)?
--  ------------------------------------------------

The Speed is 10.3 Kts, Var is 12dE, Dev 0.5dW, Current Set 165d Kts,
Drift 0.3 Kts.

7)  What is the Compass Course(CC)/Course-to-Steer to MOP1
    (40d 00.0'N  155d 00.0'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
        Mike Wescott - wescott_mike@emc.com
        Dave Weilacher - daveweilacher@earthlink.net
        Tony Capiello - cappiello_ar@netzero.net
        Richard Berkowitz - richdberko@aol.com
        Dan Hogan - dhhogan1@earthlink.net


Dan Hogan
dhhogan1@earthlink.net

   

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