experience through the day, the tyres get hot and then they go off slightly. so the lap you did three laps ago, you're not going to get there again. and so the unit's telling you to keep trying for that time, maybe isn't the safest thing to do. there's also one other feature which is worth mentioning. it's very easy to set new tracks using the device. you just have to drive the same route three times and that could be anywhere, including public roads. now, the device discourages this through an on—screen warning set—up. and garmin told the bbc that it doesn't encourage any form of illegal activity. but what's interesting is the device's design team haven't used geofencing to restrict its use to race tracks. back on track, we wanted to see what it was like with a pro,