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The Davis has tremendous backlash.  ALWAYS come down on the sight from
the same direction - other than that it is a reasonable instrument - I
easily make sight within 3 miles.  HAVE FUN

Cheers!

Bruce

Quoting Tracy Shrier :

> Hi Phillip,
> Monday I took my first marine sextant noon sight off an artificial
> horizion in my back yard, today I read your post, funny coincidence!
> Attached is my work up for your interest. You're seeing my raw data
> as directly recorded and reduced so I apologize for the sloppy
> writing. Some notes on my sight and workup:   I used water in the
> artifical horizon box which caused some issues noted. With the
> artifical horizon the raw hs is double a horizon sight (hsx2
> column). I simply halved the hsx2 minutes for a spreadsheet plot not
> shown, but do correctly show hs at LAN - 54°54.2'. For simplicity
> this first time I did not correct hs to Ho, but looking at it now I
> belive that r is the only correction I would need to make ( -1' from
> table 6 in the Air Almanac). Lastly, being an aviator, I use the Air
> Almanac for the GHA calculation for latitude.
> For my NavList friends that are wondering where the bubble sextant
> is - I retired a month ago, no more sights from the cockpit. I'm
> going sailing in the San Juan's first of October with an old friend,
> so I'm trying to quickly teach myself nautical techniques and picked
> up a Davis MK25 to have some fun with. Hopefully you won't consider
> Lat within 6 miles and Long within 22 miles too terrible for my
> first try :)
> Tracy
>
> [plain text auto-generated]
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> Attached File: http://fer3.com/arc/imgx/NoonSight07092020.pdf
>
>
> :
> http://fer3.com/arc/m2.aspx/Longitude-noon-Shrier-sep-2020-g48523

   

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