I can't see them doing that. Yes a satnav is a distraction, but it is far less of a distraction than trying to consult a paper list of directions or a paper map, while looking out for road names which may even be behind you as you pass a junction and trying to recall the next part of the journey plan. Most roads have nowhere to stop to consult your directions, so you've got to do it on the move or end up miles past the turning you needed - even worse navigating in a busy city centre!
SteveW