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Subject: Re: [Nml] Leg 48
From: Dan Hogan (dhhogan@XXX.XXX)
Date: Fri Mar 05 1999 - 10:55:20 EST
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@XXX.XXX
> 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@XXX.XXX
Catalina 27 "GACHA"
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