This is a short video i made, showing how incredible this iphone app works, This is the HUD, head up display app that i downloaded straight from the app store. You can see the gps and speedometer, you may see differences in speed while im recording, is just because i realease the pedal. But it went off by one mile at times but mainly exactly the same as the gps. It is very accurate! great for my future Nissan GTR...
