XPost: rec.arts.sf.written, rec.arts.sf.science   
   From: gossg@gossg.org   
      
   "Rod Speed"  wrote:   
      
   >Greg Goss  wrote   
      
   >> My wife has a fairly recent GPS in her car.  Once, we had programmed   
   >> the destination into the unit because we needed it for the final   
   >> navigation -- we knew the way for the first fifteen miles.  But, with   
   >> very little warning, it abruptly told us to take an exit three miles   
   >> before the obvious one, and adjusted the time-to-destination   
   >> accordingly.  As we turned onto the overpass, we saw traffic   
   >> backing up from something further down the road.   
   >   
   >That is just poor implementation.   
      
   I think you're misreading the anecdote.  This was a good   
   implementation -- the traffic jam was still forming up, and it   
   successfully got us out of it.  If traffic starts to jam up when we're   
   thirty seconds from the last exit for several miles, a sudden change   
   is better than no change.   
      
   >> How is traffic information sent to GPS units?   
   >   
   >http://en.wikipedia.org/wiki/Traffic_message_channel   
   >   
   >> Other satellites (ex XM)?   
   >   
   >Nope.   
      
   From your link:   
   "It can also be transmitted on Digital Audio Broadcasting or satellite   
   radio."   
   --   
   We are geeks.  Resistance is voltage over current.   
      
   --- SoupGate-Win32 v1.05   
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