Show me the way: What retrofitted sat navs can do

A navigation system has long been standard in many cars. But when it comes to special requests such as camping routes or off-road tracks, many free map services reach their limits. That's when you need a specialist. — dpa

BERLIN: Anyone who rarely drives in large cities and metropolitan areas can experience some unpleasant surprises when they do head for such places.

Traffic jams are one obvious problem, but if you’re driving a camper you also need to worry about the heights of bridges and tunnels.