Fiddling around with in-car satellite navigation systems is causing motorists to lose concentration on the road, according to a survey on Tuesday. The new technology, rather than helping motorists, could be even more distracting than trying to read a map at the wheel, it added. One in 10 motorists with navigation systems set off on their journeys without bothering to program their route, and more than half admitted they had then had to take their eyes off the road to input the details while driving.