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Just did the upgrade the other day. Seems to sometimes have problems finding my tomtom BT device.
A couple of improvements:
Smoother 3D on the screen, and also the street names are overlayed on the map.
Bit annoyed that the current POIWarner (speed camera warning program) doesn't work. And i don't fancy paying tomtom for something which I can get for free.
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Yip, I had the same problem with my aftermarket BT receiver, I told TT it was a cabled receiver and it found it /ubbthreads/images/graemlins/confused.gif
Also you can use the usual (free) pocket GPS camera database as in tt3 but you only get beeps, bells or moos for a warning