Good start
Ive been using this app as a lap timer for my rc car and it works great most of the time..the car maybe too fast (30+ mph) to trigger the lap timer sometimes..im not sure what the sensitivity function on the lap timer does because it doesnt seem to help with my problem...also if this would audibly call out each lap time it would rule (and id give it 5 stars)!
$elltheProphet about
SprintTimer - Photo Finish