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               Originally Posted by 
              uk_nick  
              Zumo are for bikes, are waterproof, but road maps only.
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         The Zumo has a navigation mode called "off road"
         
        
 You can get TOPO maps for the Zumo, and they work for plotted routes off road.
         
        
 I've been using mine for off-tarmac routes for over 5 years.