Garmin distance variances vs map source - offroad / shorter / quicker?

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TornadoF5

Race Dog
Joined
Mar 28, 2009
Messages
3,457
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Location
Port Elizabeth
Bike
KTM 640 Adventure
Have a slight problem I can't seem to figure out.

Plotting a route with using mapsource and T4a I upload it to the GPs a Zumo 660 and route distance is different. I used enough waypoints to force it along the route and if I view the route on the GPS it looks identical to what I plotted?
What is the best setting for uploaded routes quicker, shorter or off road tried all three just to make sure same result?
Mapsets are identical on mapsource and the zumo,

Anyone have ideas what I'm doing wrong?
 
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