I have a new TomTom 620 and drive Coaches home and abroad when I’m in a busy City or town , I feel a Bluetooth ear piece connected to the 620 for sound would be very helpful when negotiating different roads ,roundabout and junctions ,as we always keep the voice down as not to annoy the passengers we do not have time to look at the 620 for help with directions with an ear piece it would give you directions in your ear which is less dangerous than having to take your eyes off the road to look at the 620