>Or better still, train dogs to walk only under hedges and fit them with a
>GPS :-)

I can't help thinking that this would open up a whole new genre of 
geographical-based games, ranging from geocaching (where did I hide that bone?) 
and orienteering to canine endurance records (my dog walked 100 miles in 24 
hours, and here's the proof - 30092009.gpx). Having said that, you would 
presumably get gaps in the trace whenever the dog goes down a rabbit-hole that 
would require some interpolation when they come back out of a different exit!

Donald



      
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