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Silicon Sea: Leg 67
From: Dan Hogan
Date: 2000 Jul 13, 09:42 EDT
From: Dan Hogan
Date: 2000 Jul 13, 09:42 EDT
Chart(s): Plotting Sheets
Sight Reduction and
Dead-Reckoning problem Leg 67 071300 Test your knowledge!
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Our last Estimated Position was our Noon sight(LAN) on 12/05/2000 @
11:53:58ZT. We have crossed the Equator and celebrated the Shellback
initiation ceremony with King Neptune. We are bound for the island of
Barbados(13d 10.0'N 59d 20.0'W). TC 289.9d, Speed 10.5Kts, current Drift
1.0Kts Set 285.0d.
At evening we get the following sights:
Body Zone Time Hs
Moon 18:30:00 65d 55.3'
Sirius 18:31:05 40d 14.1'
Betelgeuse 18:31:11 31d 18.7'
Capella 18:32:03 16d 56.2'
Spica 18:32:44 35d 19.5'
Dubhe 18:33:15 29d 52.3'
1) What is the UTC of the FIX at 18:30:00ZT?
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2) What is the GHA Aries of the Moon at the time of the sight?
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3) What is the FIX position at the time of the Moon sight?
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Var 19dW. Dev 1.5dE Current Drift 1.0Kts Set 295.0d. TC 289.9d. Speed
10.5Kts. Barbados(13d 10.0'N 59d 20.0'W).
4) What is the Compass Course(CC)/Course-to-Steer for Barbados
from our FIX position?
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5) What is the True Course(TC) to Barbados?
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We travel for a Distance of 614.4 mi on our TC of at a speed of 10.5Kts.
6) What is the DR position?
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7) What is the Zone Date?
What is the Zone Time(ZT)?
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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@XXX.XXX
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@XXX.XXX
John Simmonds- johnsimmo@XXX.XXX
Jim Manzari - manzari@XXX.XXX
Dan Hogan - dhhogan@XXX.XXX
Dan Hogan
dhhogan@XXX.XXX
NAV-L Web Page: http://nav.cnchost.com
