I have just two words for you:
Google Maps (on your phone)
Sorry, but maybe someone can help me out here: I just don't get why anyone would pay good money for an incar system of any description, when Google Maps is so good for free!
The simple answer to that is that lots of the UK still don't get any 3G signal to actually use Google Maps on phones. Relying on your phone for a satnav would be impossible in large parts of Scotland, Wales, rural England.
I'm sitting in work right now, on an Industrial Estate that, in total, employs close on 2k people, on the outskirts of a town that has 15k residents. No 3G on my phone though. Five 'bars' of signal, but GPRS.
Get outside the big cities and suburbia where 4G is being trumpeted as the new standard, and you'll find a very different reality.
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