However, it will not be quite so easy for passengers to help enter new routes into the sat-nav or tune the radio while the driver's concentrating on the road ahead.rosie.mcmahon@whatcar.comWeek ending October 21Mileage 800Miles driven this week: 488 milesThe sat-nav has some very useful features on it, such as showing you where to find local amenities such as fuel stations, restaurants and even pharm