*********************
ANN: With this Leg I am pleased to announce that John Simmonds has joined
the Working Group. He is the author of MNAV and Nautical Almanac navigation
programs. Also Wes Murfin has rejoined, producing his excellant Silicon Sea
chartlettes. Please do not contact working group members directly but post
your questions or comments to the List. Thank you.
**********************

See the "Note:" for change in time format.

CHART: 30d Lat. Plotting Sheet

Sight Reduction and 
Dead-Reckoning problem     Leg 22  031997   Test your knowledge!
----------------------     ------  ------   --------------------

Our position FIX at 17:40:00, 05/6/96 GMT was (32d 10.4'N  28d 49.9'E).
Masabb Dumyat is (31d 30.1'N  31d 50.0'E). Our speed is 9.9 Knts.,
Var 0.0W, Dev 4dE.

1)  What is the TC and Dist to Masabb Dumyat?
--  -----------------------------------------

2)  From our FIX at a speed of 9.9 Knts what is the estimated Zone Time
     of arrival at Masabb Dumyat, to the nearest minute?
--  -------------------------------------------------------------------

3)  There is a tower with a beacon at Masabb Dumyat. The chart states
     it is at a height of 151 meters.
    What is the distance from our fix to the visable horizon range
     of the beacon?
--  -----------------------------------------------------------------

4)  At 9.9 Knots what is the Zone Time and date of the light being
     on our horizon, to the nearest minute?
--  ---------------------------------------------------------------


5)  What is the expected DR position for seeing the the Beacon on the
    horizon?
--  -----------------------------------------------------------------

6)  What is the Compass Course?
--  ---------------------------

We sail on skipping an evening sight. At 03-50-00 GMT we plot a DR
Position using the data from our last fix.

7)  What is this DR position?
--  -------------------------

We take the following Sights using our last plotted DR position:

          GMT             Body            Hs            Zn
  
          03:52:10       Polaris        32d 10.7'       0.7d
          03:57:30       Mars           28d 05.1'      84.0d
          04:01:22       Moon           37d 06.3'      217.4d
          
8)  What is the position FIX?
    Did using the DR cause any affect on the star sights?
    What do you think caused the Moon diferance?
--  --------------------------------------------
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.

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 Navgation List Working Group=-

        Peter Smith  - psmith@wellspring.us.dg.com
        Ron Legere   - ronald.legere@yale.edu
        Tony Severdia- anthonys@ix.netcom.com
        John Simmonds- mobi@netconnect.com.au
        Wes Muffin   - wmurfin@onslowonline.net (Cartographer)
        Dan Hogan    - dhhogan@lightside.com
        
Dan Hogan 			Yacht GACHA
    West Covina, CA		Catalina 27
    dhhogan@lightside.com	San Pedro, CA






