Self-driving cars need to know exactly where on the road they are located at all times. A new invention could revolutionize the development of driverless vehicles – and give us more accurate GPS on our mobile phones and fitness watches too. Denne saken er også tilgjengelig på norsk We mostly take it for granted that the position shown by our GPS is correct. But if we are in a new city and use the map app on our phone to find our way back to the hotel, it can often look like we are jumping around...