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    Re: Aviation Bubble Sextant
    From: Gary LaPook
    Date: 2010 Sep 10, 09:35 -0700

      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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