NavList:
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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 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-= =-= TO UNSUBSCRIBE, send this message to majordomo@ronin.com: =-= =-= navigation =-= =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=