it's a straight swap and needs no setting up
basically it has a bigger screen that it uses to display traffic info. On the right are 3 bars representing the road and the neam is shown up the top. From my understanding of how it works the bars that light up tell you how long the traffic is and how far away.
I've had mine fitted about a week and it is a very handy bit of kit. When I was driving back from glasgow at one point it was showing me info for 3 motorways at once
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