Zero to Sixty HUD is a Head Up Display that times and archives how long it take to drive from 0 to 60 or 0 to 100. When the vehicle is at rest, the timer resets and wait for the vehicle to be in motion. Once the vehicle is in motion the timer starts and when the vehicle reaches sixty miles per hour the time is recorded and spoken aloud. This App uses your GPS location for tracking your speed. For the must accurate experience please make sure your iPhone has GPS location turned on and is accessible to receive GPS data.