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       xkcd - A Webcomic - Cheap GPS (407)
        
       Image:
       cheap_gps.png
        
       In lieu of mapping software, I once wrote a Perl program which,
       given a USB GPS receiver and a destination, printed 'LEFT'
       'RIGHT' OR 'STRAIGHT' based on my heading.
        
       Comics reproduced from www.xkcd.com under license.
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