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Subject: Re: [Nml] Leg 48
From: Dan Hogan (dhhogan@XXX.XXX)
Date: Thu Mar 11 1999 - 09:34:59 EST
M. Lieberman:
> Leg 48:
>
> 1. DR 34deg 22.4' S 155deg 22.3' E by meridonal parts calculation. I
> elected to use the steered course of 89.1M or 103.6 T . Since a DR was
> asked for I did not factor in current
Your OK. Remember this is DR and celestial navigation "an art", not a
manmade accurate to 16 decimal places and dependant on electrons
system. And I threw in a twist here.
> Last FIX was at 19:32:20 Zone Time (+10) or 9:32:20 GMT , adding the
> 10:57:58 to run the
> 95.5 miles gives 20:30:16. The date stays the same, 17 Feb 99.
>
> 2. DR now 34deg 33.7 S 155deg 54.7 E. Again, no current correction
OK everything is consistant.
> 3. New true course is 112.8 deg.
OK. My fault I didn't specify that the previous current still applied.
> 4. I think I need a FIX before I can calculate the Course made good.
Use CDMVT and the current.
> 5. I get a DR of 35deg 4.5' S 157deg 24.1 E.
Your navigation is consistant. I threw you off with Q3. But as you'll
see NOT LOST.
>
> 6. I discarded Rigil Kentaurus because of the low sight ( lazy, too) and
> came up with a FIX of 35deg 00.2' S 156deg 59.6 E. (By calculator) This
> is 20.5 miles and 282 deg. from the DR position. I now get a course made
> good of 116.5deg T from the #2 DR.
Good FIX.
> 7. Seems to be Jupiter. (by calculator after a long wait)
Yes. Easy way is by inspection, using GHA and the Nautical Almanac.
Dan Hogan WA6PBY
dhhogan@XXX.XXX
Catalina 27 "GACHA"
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