Unless you're on an unlimited data plan, then i dont advise using it as your main sat nav.
if you're willing to spend, might be worth to check out the paid sat nav apps. you download the maps onto your phone, and they're loaded onto your phone like a tomtom and you then dont have to have a data connection to use it.
Set the route when you are connected to wifi. This should make a big dent in the data usage. You can even disable data while you are driving but this will stop live traffic update service.
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