This app is one of the most amazing apps available for the iOS platform. The amount of functionality it provides eclipses what youd expect on a desktop application, let alone a mobile device.
Bottom line is, if you want to record vehicle data, either on the track or street, and combine that with video, this app can drive it all.
Issues? Harry maintains a great forum for his products and is extremely responsive. The amount he charges for these apps is a complete bargain.
nuclearchadwick about Harry's LapTimer Petrolhead, v17.4.1