From: teeks99stuff@yahoo.com   
      
   Ian Stirling  wrote in news:41dbbcaf$0$71964   
   $ed2e19e4@ptn-nntp-reader04.plus.net:   
      
   > GPS units are by default limited to mach 3 and 30000 feet (?) or so.   
   > They won't display over this.   
      
      
      
   Since its just software, has anybody hacked these to use their own software   
   that doesn't have the limits in it?  I have no idea of what's entailed...I   
   know GPS uses some interesting frequency patterns and lots of complex math,   
   is it possible to build your own?   
      
   Tom   
      
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