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    Re: Boundary error case
    From: Irv Haworth
    Date: 2008 Jan 09, 11:56 -0800

    Hi :
    I too just (Dec2007) found a similar error in using the navigational module
    in my 20+ year old hP41CX calculator ...one never knows..so alternates are a
    must.
    Irv
    
    -----Original Message-----
    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf
    Of Dan Allen
    Sent: January 9, 2008 11:30 AM
    To: NavList
    Subject: [NavList 4389] Boundary error case
    
    
    The Lockheed Martin F-22 Raptor fighter about a year ago hit an interesting
    bug in the navigation software, something we should all be aware of when
    writing navigation software.
    
    This brief excerpt is from Wikipedia
    ():
    
    ---
    
    While attempting its first overseas deployment to the Kadena Air Base in
    Okinawa, Japan, on 11 February 2007, a group of six Raptors flying from
    Hickam AFB experienced multiple computer crashes coincident with their
    crossing of the 180th meridian of longitude (the International Date Line).
    The computer failures included at least navigation (completely lost) and
    communication. The fighters were able to return to Hawaii by following their
    tankers in good weather. The error was fixed within 48 hours and the F-22s
    continued their journey to Kadena.
    [47][48]
    
    ---
    
    That's a fast turnaround time on a bug fix in the military world!
    
    Beware the 180th meridian!
    
    Dan
    
    
    
    
    
    
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