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I cant speak for pro-nav, but I was recently charged £250 to upgrade business nav to 2013 software as part of a warranty (!!!!!) repair in an attempt to cure the lethal mis-directions randomly served up by my BMW F10 sat nav.
Complete waste of money.
Stick with what you've got. It if it works for you, be happy.
An example of mis-direction, would be to turn right through a gap in the central reservation and immediately turn left, NOW. The road in question has been there for around 20 years, so BMW cant blame a mapping error. This is not an isolated example.
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