NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Silicon Sea: Leg 32
From: Dan Hogan
Date: 1997 Jul 30, 1:33 PM
From: Dan Hogan
Date: 1997 Jul 30, 1:33 PM
Sight Reduction and
Dead-Reckoning problem Leg 32 073097 Test your knowledge!
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At 24:00:00ZT on 28/06/1996 our EP was (12d 37.9'N 60d 31.0'E).
Our plotted TC is 123.2d Speed 8Kts, Current Drift 9 Kts @ Set 86d. Var0dw
Dev2dW.
1) What is the Speed Made Good(SMG)?
What is the Compass Course Made Good(CCMdGd)?
-- ---------------------------------------------
Using the SMG and our TC.
2) What is our Estimated Position(EP) at 0800ZT on 28/06/1996?
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3) From this DR what is the TC and Dist to the Mali' Waypoint
(04d 10.0'N 73d 30.0'E?
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At Noon We get a break in the clouds and get a LAN sight of the
Sun. Use the DR for 12:00:00ZT this date.
4) What is the Zone Time(ZT) of Meridian Passage of the Sun?
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5) What is the Zone Description?
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6) What is the Noon LAT if the Sun's Hs was 74d 08.3'?
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7) What is the differance in Lat?
Is the LAN N or S of our DR?
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8) What is the DR at 19:00:00ZT, using the Q3 TC and SMG?
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Note:
Lat & Lo = XXd XX.X', Date=DD/MM/YY, HE 8 Feet, Index correction -.2', Time
hh:mm:ss in UTC/GMT. Silicon Sea is a medium displacement sailing vessel, 40
Feet LOA. 38 Feet LWL; Cutter rigged. Looks a lot like a Mason. Can tack to
45d. Dist to Horizon: Nmi = SQRT HE@mtrs x 2.07; Nmi = SQRT HE@ft x
1.17. Water Tank = 60 gal(Imp.). Fuel Tanks = 90 gal (Imp.). Fuel
consumption .450 gal/Hr at 8.3 Kts.
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@wellspring.us.dg.com
Ron Legere - ronald.legere@yale.edu
Tony Severdia- anthonys@ix.netcom.com
Wes Muffin - wmurfin@onslowonline.net (Cartographer)
John Simmonds- mobi@netconnect.com.au
Dan Hogan - dhhogan@lightside.com
Dan Hogan WA6PBY Yacht GACHA
West Covina, CA Catalina 27
dhhogan@lightside.com San Pedro, CA
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