NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Silicon Sea: Leg 37
From: Dan Hogan
Date: 1997 Dec 27, 11:19 PM
From: Dan Hogan
Date: 1997 Dec 27, 11:19 PM
Chart(s): Plotting Sheet
Sight Reduction and
Dead-Reckoning problem Leg 37 122697 Test your knowledge!
---------------------- ------ ------ --------------------
We have been sailing under a solid overcast. Our DR position is
12d 40.9'S 98d 01.6'E, 07/10/1996 @ 13:44:00GMT. The TC is 122.7d,
Var 3dW, Dev 4dW. Current Set 030d Drift 8 Kts. Wind is 15 Kts from 090d.
Speed is 10 Kts.
1) What is the TC and Dist to Cocos/Keeling Island(12d 02.0'S
97d 00.0'E)?
-- ----------------------------------------------------------
It appears that we have missed the island. Taking the consideration
of weather and information from our Pilot Chart of The Indian Ocean
for July. We plot a course for our next waypoint, Cape Leeuwin, Australia.
(34d 15.0'S 116 06.0'E)
2) What is the TC and Dist to Cape Leeuwin?
-- ----------------------------------------
3) What is the Compass course to Steer for Cape Leeuwin?
-- -----------------------------------------------------
4) What is the Speed Made Good on this course?
-- -------------------------------------------
We log our turn to the new course at 19:00:00 of 07/10/96. We run
into a period of intermittant rain showers and poor visibilty.
5) Using the speed made good of Q4, what is the Estimated Position
(EP) at 12:15:00 @ 7/14/96?
-- ---------------------------------------------------------------
Just after plotting our position the Sun peeks out through a cloud
and we grab a quick sight.
Body Hs Zone Time
SunLL 53d 20.7' 12:21:28
6) What is the LOP that this sight provides?
-- -----------------------------------------
7) What is the Azimuth(Zn) of the Sun?
-- -----------------------------------
8) What is the plotted latitude?
-- -----------------------------
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@pacbell.net
Wes Murfin - wmurfin@onslowonline.net (Cartographer)
John Simmonds- mobi@netconnect.com.au
Dan Hogan - dhhogan@lightside.com
*****************************ANSWERS************************************
1) TC= 302.7d
Dist= 72 mi
2) TC= 125.4
Dist= 1197.3 mi
3) CC= 103.2d
4) SMG= 2.5 Kts
5) EP= 14d 50.2'S 101d 07.7'E
6) LOP= Latitude line/Speed Line
7) Az= 360d
8) Lat= 14d 49.1'SChart(s): Plotting Sheet
Sight Reduction and
Dead-Reckoning problem Leg 37 122697 Test your knowledge!
---------------------- ------ ------ --------------------
We have been sailing under a solid overcast. Our DR position is
12d 40.9'S 98d 01.6'E, 07/10/1996 @ 13:44:00GMT. The TC is 122.7d,
Var 3dW, Dev 4dW. Current Set 030d Drift 8 Kts. Wind is 15 Kts from 090d.
Speed is 10 Kts.
1) What is the TC and Dist to Cocos/Keeling Island(12d 02.0'S
97d 00.0'E)?
-- ----------------------------------------------------------
It appears that we have missed the island. Taking the consideration
of weather and information from our Pilot Chart of The Indian Ocean
for July. We plot a course for our next waypoint, Cape Leeuwin, Australia.
(34d 15.0'S 116 06.0'E)
2) What is the TC and Dist to Cape Leeuwin?
-- ----------------------------------------
3) What is the Compass course to Steer for Cape Leeuwin?
-- -----------------------------------------------------
4) What is the Speed Made Good on this course?
-- -------------------------------------------
We log our turn to the new course at 19:00:00 of 07/10/96. We run
into a period of intermittant rain showers and poor visibilty.
5) Using the speed made good of Q4, what is the Estimated Position
(EP) at 12:15:00 @ 7/14/96?
-- ---------------------------------------------------------------
Just after plotting our position the Sun peeks out through a cloud
and we grab a quick sight.
Body Hs Zone Time
SunLL 53d 20.7' 12:21:28
6) What is the LOP that this sight provides?
-- -----------------------------------------
7) What is the Azimuth(Zn) of the Sun?
-- -----------------------------------
8) What is the plotted latitude?
-- -----------------------------
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@pacbell.net
Wes Murfin - wmurfin@onslowonline.net (Cartographer)
John Simmonds- mobi@netconnect.com.au
Dan Hogan - dhhogan@lightside.com
Dan Hogan WA6PBY
"Gacha" Catalina 27
(1)dhhogan@lightside.com
(2)dhhogan@concentric.net
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