iPhone GPS Lap Timers

[Kuba83]

Can anyone recommend a good iPone gps lap timer? Some are free and some cost money, I don't mind paying for one just as long as it works well. Primarily, I want to use it for track days at Race City.

I'm thinking about getting the Harry‘s GPS LapTimer but thought I'd ask before I get it, thanks.

[4DoorGTZ]

I read a article in Modified about iphone lap timers..... Here's a link for ya.

http://www.modified.com/tech/modp-1007-iphone-app-education/index.html