Non-routable OWM topo maps

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Spastic Spy

Pack Dog
Joined
Jun 16, 2012
Messages
389
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Location
Cape Town
Bike
Yamaha XT 600 Z
Garmin is replacing my faulty Oregon 450 with a GPSMAP 64S and offered to load a non-routable OWM topo map for me. I know the topo map gives you contour lines, but I'm not sure what they mean by it being non-routable.
Can anyone explain to me what that is?
I have a 2012 or 2013 T4A map on a SD card that I use when go off road either by car or bike but have not used the GPS to it's full potential.
 
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