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RE :
http://www.fer3.com/arc/m2.aspx?i=115732
[NavList] Re: 12 Feb 2011 Unorthodox Jupiter Lunar from a moving platform
From: waldendand---com
Date: 23 Feb 2011 08:01

Dear Dave,

Thanks for your explanation.

As you already noticed it, the various "Ship's System" positions given in my earlier posts all refer to different UT's. They are all equivalent on an operational standpoint here. None to is to be considered/ preferred to/more exact than any other.

Good point that on your graph your successive fixes show a 315°/135° direction ... it should have caught my attention.

Various UT values were derived and published by Lars, Lars/Kermit, Kermit, and yourself. Accordingly if meaningful comparisons are to be performed about the accuracies of such results, then each DIAMOND CLUB Member's resulting UT and Position is to be compared to the actual Ship's position for such same UT.

From your published graph I already knew that your resulting position is a good and solid one. But - after I have closely read your post this time - I cannot tie up your "+ 0 hr 23 min 35.285337 sec" time result to any UT counterpart value. Therefore I cannot exactly "locate you" relatively to actual position.

What is then your derived UT corresponding to your published N4636.449266W00229.024725 Position ? From such UT time, compared to the Ship's Navigation data for the same UT, it will be easy to locate your position and then (more accurately then/maybe ?) plot it against our other results ... and perhaps you will eventually sail (back) closer to Kermit's Vessel as you are often used to ... :-)

Finally, in this kind of "unusual" Navigation with only a Sextant and a Chronometer in "Elapsed time" mode we do not have immediate access to the actual/true (averaged) UT TIME of LD, unless such Time is computed from the Ship Navigation System positional data afterwards, i.e. once the (averaged) LD is known. It can be done for example by trial and error with Frank's OLLC, and I should have such info somewhere on file. Nonetheless I think that it would present only a quite limited additional operational interest given that our various Members' positions are all published for different UT's.

Thanks for your Kind Attention, Thanks for your UT reply, and

Best Regards

Kermit

Antoine M. "Kermit" Couëtte

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