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    Re: Leg 48
    From: Dan Hogan
    Date: 1999 Mar 05, 8:55 AM

    Millard:
    
    > Nav List.
    >  Still working with the Celesticomp V:
    >
    >        ZT Time & Date	     		GMT & Date
    >            19:32:20	17/02/1999        09:32:20   17/02/1999
    >
    > 1) DR    34d 22.4'S   155d 22.0'E    	     06:30:16 18/02/1999
    > 21:30:16    17/02/1999
    > --------------------------------------------------------------------------
    > -- -----------------------
    >  To find DR on Celesticomp V I needed to know time at DR.  To find time I
    > used the old D=rt were r=kt and assumed 95.4 mi was nm.  Found time from
    > start to turn point was 10hrs 57 min 56 sec which gave the ZT time of
    > 06:30:16  Plug in data in Celesticomp and out came DR.
    > --------------------------------------------------------------------------
    > -- ------------------------
    >        ZT Time & Date	     		GMT & Date
    >            09:50:16  18/02/1999       23:50:16  17/02/1999
    
    Yes, the problem with celestial calculators and most computer programs
    is that they assume you are on a voyage going from Point A to Point B
    and calculate as such. D= s*t will work. But better yet is a DR program
    such as Mid-Latitude, Mercator Sailing, Plane Sailing  or Traverse
    where distance is used. If you use D/ST in the calculator to compute
    time make sure you use the correction from time to decimal as may be
    required by your calculator.
    
    Also remember we are calculating back from a Compass Course(CC)/Course-
    to-Steer to find TC. This ALWAYS includes current.
    
    > 2)  DR  34d 29.3'S
    
    Lat is off from my numbers, May be due to method from Q1.
    >
    > 3) 112.8d
    OK
    >
    > 4) CCMG   102d       Tr Cs Mg  117d
    >
    >        ZT Time & Date	     		GMT & Date
    >            19:00:00  18/02/1999	09:00:00  18/02/1999
    >
    > 5)  34d 48.7's	157d 29.6' E
    
    Off from my numbers about the same as previous answers.
    >
    > GMT	 	Body		    Hs		    Hc		A/T		Zn
    > 09:00:00	Saturn	24d 13.1'	23d 50.8'	T 14.7		300.9
    > 09:05:22	Betelguese	47d 06.2'	47d 15.4'	A15.5		  10.3
    > 09:07:00	Rigil Kent	11d 52.1'	11d 40.2'	T  1.8		160.4
    > 09:09:10	Miaplacidus	44d 13.8'	44d 07.9'	A  0.5		156.5
    > 09:15:19	Pyocyon	40d 22.3'	40d 41.1'	A 25.3	 41.8
    >
    > 6)	34d 59.8'S   156d 59.3'E  Dr to fix 27nm in the direction of 245d
    OK
    >
    > 7)	I have yet to figure out how to do this type of  problem.
    
    Easy way is a look up in the Almanac for a body with at GHA and with a
    Declination close to your Hs and Zn calculations or use a Star Finder.
    But doesn't the Celesticomp have a program to find an unidentified
    body?
    >
    > Still...............
    >
    > Learning the Hard Way!!
    >
    > Millard Kirk KB8YQO	|  mailto:mkirk{at}marshall.edu
    > 116 Lewis Ave	    	|  Homepage- http://webpages.marshall.edu/~mkirk/
    > Barboursville, WV		|  A West Virginia Blue Water Sailor
    > 25504            		|  Phone: (304) 736-6544
    > First United Methodist Church, Barboursville, WV
    > Homepage  http://www.gbgm-umc.org/bfumcwv/
    
    Dan Hogan WA6PBY
    dhhogan{at}concentric.net
    Catalina 27 "GACHA"
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