Could be the mapset,could be a software issue,i don't know.The glitches i speak of are unusual to say the least;input a certain postal code and it attempts to navigate along totally incorrect routes and then plots a perfectly straight route along non-existant roads.It's obvious when it happens as the distance left is massive and totally wrong.I'll try to get a couple of screen shots to show what i mean.
I only use here/navteq maps on my system,always used for truck use and had very little "dodgy" routing,which could be very awkward in a large vehicle.
With tt or anything tomtom related,i had in the past, numerous major routing mistakes which is too risky,hence i won't ever use them again,it maybe ok for car use but not for me.
Just my view,i need 100% confidence in my setup,along with the usual common sense.
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