MotionMap real-time bus app

Brilliant idea for an app but it just doesn’t work in reality. As a frequent Cambridge bus user this app appears to be brilliant but sadly, the “live” bus tracking appears to just be guessing based on the timetable rather than actually tracking the buses. I can stand at a bus stop and the app says I should be able to see the bus but it isn’t there. The bus doesn’t turn up and it vanishes from the app. In the end I just go to the stop and wait for a bus, no differently than before the app came along.