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Subject: Leg 73 Revised 09/06/2001
From: Dan Hogan (dhhogan@XXX.XXX)
Date: Sat Jun 09 2001 - 13:43:39 EDT
Leg 73: Revised 09/06/2001
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Chart(s): Plotting Sheets
Sight Reduction and New Revised
Dead-Reckoning problem Leg 73 060901 Test your knowledge!
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We are bound for a waypoint North of Aruba called Aruba Gap(13d 50.0'N
70d 00.0'W).Our last position FIX was (13d 30.0'N 67d 00.0'W) 01/06/2001
@XXX.XXX7 Kts,
Set 275.0d.
1) What is the Compass Course/Course-to-Steer for Aruba Gap(13d 50.0'N
70d 00.0'W)?
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|At 14:30:22UT the same day. We take an Sight of the SUN LL. Hs 60d 24.7'.
Speed 9.5 Kts, TC 276.5d.
2) What is the DR position at the time of the 14:30:22UT sight?
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We continue sailing and prepare for a Noon sight which according to the
|Nautical Almanac occurs at 11:58:00LMT.
|3) What is the estimated Zone Time(ZT) of our Local Meridian Passage?
Only required to the nearest whole minute.
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Ten minutes before LAN we are on deck and prepare for a Noon Sight.
|SUN LL Hs 81d 19.8'.
4) What is the Noon latitude?
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Using the morning Sun sight at 09:30:22ZT and the Noon LAN work a
RunningFIX(RFIX) to the Noon sight.
5) What is the Running FIX(RFIX) position?
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Speed 9.5Kts, Var 9dW, Dev 1.0dE. Current Set 270.0d Drift 1.0Kts.
6) What is the Estimated Zone Time of Arrival(ETA) at Aruba Gap
(13d 50.0'N 70d 00.0'W):
ZT time and date?
UT time and date?
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We will change our heading when the elapsed time and distance on the
Knotmeter log indicate that we are at the Aruba Gap(13d 50.0'N 70d 00.0'W)
waypoint.
7) What is the TC, Compass Course(CC)/Course-to-Steer, and distance from
the RFIX to Aruba Gap?
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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 - Smith_Peter@XXX.XXX
John Simmonds - johnsimmo@XXX.XXX
David Weilacher - daveweilacher@XXX.XXX
Tony Cappiello - cappiello@XXX.XXX
Frank Norris - NORRIS_FRANKLIN_H@XXX.XXX
Sam Chan - schan@XXX.XXX
Dan Hogan - dhhogan@XXX.XXX
*****************************ANSWERS LEG 73*******************************
1) CC= 285.6d
|2) DR= 13d 35.2'N 67 46.8'W
|3) Meridian Passage= 11:30:42ZT
|4) Lat= 13d 37.8'N
|5) RFIX= 13d 37.8'N 68d 10.5''W
|6) ETA= 06:44:22UT 02/06/2001
01:44:22ZT 02/06/2001
|7) TC= 265.8d
Dist= 107.4 Nmi
CC= 273.4d
Dan Hogan WA6PBY
C27 "Gacha"
dhhogan@XXX.XXX
Nav-L Page: http://www.wa6pby.com
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