# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Silicon Sea: Leg 32
From: Dan Hogan
Date: 1997 Jul 30, 1:33 PM

```Sight Reduction and
----------------------     ------  ------   --------------------

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?
--  -----------------------------------------------------------

3)  From this DR what is the TC and Dist to the Mali' Waypoint
(04d 10.0'N  73d 30.0'E?
--  ----------------------------------------------------------

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?
--  ---------------------------------------------------------

5)  What is the Zone Description?
--  -----------------------------

6)  What is the Noon LAT if the Sun's Hs was 74d 08.3'?
--  ---------------------------------------------------

7)  What is the differance in Lat?
Is the LAN N or S of our DR?
--  ------------------------------

8) What is the DR at 19:00:00ZT, using the Q3 TC and SMG?
-- -----------------------------------------------------

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!

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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```
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