Ive also used track addict at sandown, PI and winton. Was accurate to 0.05 sec and can be used as a camera. Was a little bit patchy at winton on the phones internal gps. Awesome considering it's free. Also used race chrono but moved to track addict for the camera capability. Would love to come to Sandown, trying to convince the wife after writing off my last car at a track day. My new ride needs a shakedown, I have a lot of convincing to do . will let u guys know how I go with that.