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Hi  Jim

Thanks for your comments and kind words.

I still need to put some more time into my star sights - I seem to be
getting better result from sun sights. This may be because one of my
lamps is not working, so I struggle to get the time noted quickly.
Also, the mosquitos are a bit distracting!

In terms of the Delta between my actual position and the lines of
position, I usually get sun sights with Delta's of between -3NM  and
+3NM. They are not well separated in azimuth terms and the fix is about
5 NM from the > actual position.

I'd be interested in seeing any photos of your instrument you may have.

Regards
Steve G

> ----- Original Message -----
> From: "Jim Dullea" 
> To: 
> Sent: Tuesday, February 11, 2003 9:05 PM
> Subject: Re: Bubble Sextant
>
>
> > Steve,
> >
> > Very nice site with great pictures.  Your learning curve on position
> > accuracy seems at least comparable to mine using the Bendix Navy Mk
V with
> > about the same level of practice.  I agree with you assessment that
in
> > aircraft at several hundred Knots this accuracy is probably
> sufficient....I
> > don't expect to get much better than the 2-3 nm
> >
> > Since I know my AP using GPS very accurately and not needing to use
a
> moving
> > fix I used multiple sites throughout the day trying out stars,
planets,
> moon
> > and sun.  I achieved the following
> >
> > Day 1:  Sun lower limb, Rigel, Betelgeuse ---   4.45 nm
> > Day 2:  Sun lower limb, moon lower limb, Rigel  3.86 nm
> > Day 3:  Sun and moon lower limb and Polaris     4.91 nm
> > Day 4:  Sun and moon lower limb and Jupiter     8.61 nm (poorly
dispersed
> in
> > azimuth for a good position, all within 90 degrees)
> >
> > Use all 12 LOP's  2.84 nm
> >
> > From the plot it appears I have better plots using stars and planet
than
> > with the moon and sun which makes me want to consider how
> >
> > Jim Dullea
> >

   

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