Yes, my average is also typically in the 5 to 10 NM range with a bubble sextant.
JPP
--- On Sun, 11/9/08, bruce hamilton <bruce.hamilton@shaw.ca> wrote:
From: bruce hamilton <bruce.hamilton@shaw.ca>
Subject: [NavList 6480] Re: The Moon and bubble sextant
To: NavList@fer3.com
Date: Sunday, November 9, 2008, 9:59 PM
That was with the A10. The Mark IX is still lacking a bubble, and I
need to get in to work to use the shop to fill it. BTW I assume there
was a LOT of luck with those 2 moon sites. I am lucky to get a 10 mile
error with stars. My average is 5 to seven miles.
jean-philippe planas wrote:
> Was that with your new MkIX or with the A10?
>
JPP
>
>
>
> --- On *Sun, 11/9/08, bruce hamilton /<bruce.hamilton@shaw.ca>/*
wrote:
>
> From: bruce hamilton <bruce.hamilton@shaw.ca>
> Subject: [NavList 6475] Re: The Moon and bubble sextant
> To: NavList@fer3.com
> Date: Sunday, November 9, 2008, 1:17 PM
>
> Thanks Mike that worked well, and I tried another method that I would
> like to know if anyone else has had luck with. I put the lower limb in
> the center of the bubble. (My AP is my actual position on earth.)First
> result the LOP .3 NM from AP second try was 1.1 NM from AP. My luck
> factor was very high last night! I wish I had taken the a-12 out too.
>
> Mike Burkes wrote:
> > Hi Bruce, Air
> Almanac not necessary for Moon corrections. Refer to
> > Nautical Almanac page xxxiv after
the "Increments and
> Corrections"
> > Table and I quote:" For bubble sextant observations ignore
dip, take
> > the mean of upper and lower limb corrections and subtract 15'
from the
>
> > altitude." Hope this helps, have fun I know I do! I also
have an A-10
>
> > and my only complaint is lack of total sun filtering,i.e. the
> > potential for eye damage is possible so be careful.
> > Mike Burkes
> > 626-833-1521
> >
> > > Date: Sat, 8 Nov 2008 22:30:46 -0800
> > > From: bruce.hamilton@shaw.ca
> > > To: NavList@fer3.com
> > > Subject: [NavList 6465] The Moon and bubble sextant
> > >
> > >
> > > I have never shot the moon with my bubble sextants and it is
the only
> > > body that is
peeking out from the gloom tonight. It is quite
handy
> > > actually
> as it peers through quite a lot of cloud and a light filter
> > > sharpens it up nicely. As I am sure all of you understand, I
have to
> > > make sure that my balcony has not changed location on the
face of the
> > > earth. I do not own an Air Almanac yet, and I was wondering
if it
> > > contained correction tables for the moon and sun that were
made for a
> > > bubble sextant. With the sun, I just use the star
corrections, or
> > > average the upper and lower limb.
> > >
> > > I just got a Mark IX on e-bay for 31 dollars. It is missing
the cover
> > > for the averaging clockwork system, and I will have to fill
the
> bubble
> > > system, but it is otherwise fine. I
found a reference to a
page on
> this
> > > list that gives me all the details I need to remove and fill
the
> bubble
> > > mechanism.
> > >
> > > I now own an A-12, and A-10, and the Mark IX.
> Can I stop collecting
> now?
> > >
> > > Bruce Hamilton
> > > Vancouver, BC
> > > CN89kg
> > >
> > >
> > >
>
>
>
>
>
> >
>
>
>
>
>
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