Is Racebox GPS and RaceChrono Pro really accurate for lap timing? Lets put it to the real test.

People often ask about using GPS lap timers and if they give real accurate results, I was unsure myself so I put it to the test. Lap timing on track days is not permitted so I use a my race outing to see how it compared to official timing methods. 00:00 Intro 00:22 TSL Timing Transponder 01:16 Racebox Mini v's Racebox Micro 02:12 Racebox Android Software 02:52 Racechrono Android App 03:51 Lap Data and times 05:00 Official Lap data from TSL 06:10 The Start Line v's the Control Line 07:42 Compare the times! 09:20 Without a proper GPS receiver 10:40 Garmin GLO2