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Subject: Silicon Sea: Leg 88
From: Dan Hogan (dhhogan1@XXX.XXX)
Date: Wed Jun 25 2003 - 09:29:52 EDT
ATTN:
I am going sailing for a few weeks so the next Leg of Silicon Sea will not be
posted until after mid-August.
Cheers
-Dan-
**********************CUT HERE******************************************
NOTE: Since we are close to home port arrival for Silicon Sea, the
remaining celestial problems will use the 2002 Nautical Almanac.
Chart(s): Plotting Sheets
Sight Reduction and
Dead-Reckoning problem Leg 88 062503 Test your knowledge!
---------------------- ------ ------ --------------------
We are headed for Mid-Ocean Point 1 (MOP1) (40d 00.0'N 155d 00.0'W).
On 09/09/2002 @XXX.XXX
TC 327.4d, Speed 10 Kts, Drift 0.4 Kts, Set 273.0d. Var 15dE, Dev 1dW.
1) After 39Hours, what is the DR position?
-- ----------------------------------------
2) What is the Zone Time(ZT) and date of this DR position?
-- -------------------------------------------------------
Since the sky is a solid overcast, we were not able to take any
celestial sights. We decide to alter course for Mid Ocean Point 2
(MOP 2) (45d 00.0'N 118d 15.1'W).
3) What is the TC and Dist to MOP 2?
-- ---------------------------------
Var 11.0dE, Dev 1.5dW, Current Drift 0.4 Kts, Set 120d. Speed 10 Kts.
4) What is the Compass Course(CC)/Course-to-Steer to MOP 2
(45d 00.0'N 118d 15.1'W)?
-- --------------------------------------------------------
On this same day at a DR position of (39d 46.1'N 153d 54.8'W) at
12:12:34ZT we manage a quick sight of the SUN. Var 11.0dE, Dev 1.5dW
SUN LL Hs 54d 48.1'
5) What is the Estimated Latitude line of this Sight?
-- ---------------------------------------------------
At 05:10:21UT 11/09/2002 we manage a sight of an unknown body through a break
in th cloud cover.
Bearing by Hand Compass 266.4d, appearing to be a magnitude 0.1.
Hs 33d 45.0'
6) What is the Name of this Body?
-- -------------------------------
Using the earlier SUN sight and this Body sight for a running FIX.
7) What is the Running FIX(RFIX) position?
-- -------------------------------------------------------------
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 - Smith_Peter@XXX.XXX
Mike Wescott - wescott_mike@XXX.XXX
Tony Capiello - cappiello_ar@XXX.XXX
Richard Berkowitz - richdberko@XXX.XXX
Dan Hogan - dhhogan1@XXX.XXX
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