Gary,
Thanks for the outstanding resources! I'm out of town for a few weeks but I'll study up on what you've provided and post my results for critique as soon as I return home.
Dave
> Date: Fri, 10 Sep 2010 09:35:05 -0700
> From: glapook@pacbell.net
> To: NavList@fer3.com
> Subject: [NavList] Re: Aviation Bubble Sextant
>
> You can start here:
>
> http://www.oceannavigator.com/content/celestial-air
>
>
>
>
> If Celstaire still has any Polhemus computers you should get one because
> it makes plotting the fix in flight easy.
>
> http://www.fer3.com/arc/m2.aspx?i=105832&y=200807
>
> This shows the process:
>
> http://www.fer3.com/arc/m2.aspx?i=105846&y=200807
>
> http://www.fer3.com/arc/m2.aspx?i=105847&y=200807
>
> Here are links on how you do celnav in flight:
>
> http://www.fer3.com/arc/m2.aspx?i=105924&y=200807
>
> http://www.fer3.com/arc/m2.aspx?i=105929&y=200807
>
> http://www.fer3.com/arc/m2.aspx?i=105937&y=200807
>
> http://www.fer3.com/arc/m2.aspx?i=105938&y=200807
>
> http://www.fer3.com/arc/m2.aspx?i=105939&y=200807
>
> http://www.fer3.com/arc/m2.aspx?i=105940&y=200807
>
> http://www.fer3.com/arc/m2.aspx?i=105940&y=200807
>
>
> You can read an example of a complete flight on my website at:
>
> https://sites.google.com/site/fredienoonan/other-flight-navigation-information/in-flight-celestial-navigation
>
> To determine the index error of an A-10 you must take a number of sights
> from a known position and compare the altitudes with the computed
> altitudes and find the average error and standard deviation. Hold the
> sextant steady on a tripod or other rest. Take ten sights moving the sun
> down into the center of the bubble and then take ten more moving the sun
> up into the bubble. Calculate the index error separately for each
> series. If there is a difference between the index error for the two
> series then you have determined the amount of backlash in the mechanism,
> there will probably be some. Then, since in flight you will be moving
> the sun up and down to keep it in the bubble, average the two index
> errors to find the I.E. to use in flight.
>
> Find your location either with a GPS or Google Earth to use for
> computing the Hc. An easy way to do this calculation from you position
> is to use the Navy website at:
>
> http://www.usno.navy.mil/USNO/astronomical-applications/data-services/cel-nav-data
>
>
>
>
>
>
> You can download a copy of the current Air Force navigation manual here:
> http://www.e-publishing.af.mil/shared/media/epubs/AFPAM11-216.pdf
>
> unfortunately it is lite on celnav.
>
>
> http://www.fer3.com/arc/m2.aspx?i=105839&y=200807
>
> gl
>
>
>
>
> On 9/10/2010 6:41 AM, Dave Harwood wrote:
> >
> > Frank, I'll use this moment as my opportunity to step out of the
> > shadows and become a NavList contributor. First, some personal info:
> > I'm active duty Air Force currently stationed in Okinawa. Several
> > years ago I took an interest in Cel Nav after reading South by Sir
> > Ernest Shackleton. After reading a few books on the subject, countless
> > Google searches and a lot of time spent at the beach, I've taught
> > myself to consistently plot a fix within 4-5 miles of my known
> > position with a Davis Mark 15. I've recently completed the ASA 101 and
> > 103 (104 scheduled for Oct) sailing courses and have put some of my
> > skills to use. Up to this point I've simply been an observer of
> > NavList. Not because I intend to simply plunder its resources without
> > giving something in return, but because I didn't believe I could
> > contribute much to the conversation at my level. I've come a long way
> > and I'm ready to jump in!
> > Enough about me already, I'll get to the point:
> > My interest has now taken me into the realm of air navigation. I
> > purchased an A-10A online and, not so surprisingly, found it to be
> > seized. With the help of Bill Morris's manual I've successfully
> > restored this unit and I would like to learn more about its use. I do
> > not intend to hijack this thread, however, in their absence I'll keep
> > it going.
> > Could someone detail its proper use and the process involved in an
> > airborne fix? I have a copy of the Air Almanac (although a 2011) and
> > plenty of opportunities to use it while airborne.
> > Also, how should I go about establishing its accuracy (e.g. index error)?
> > Thanks for any help that can be offered,
> > Dave Harwood
> >
> >
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