Anyone know of a timecard app that uses GPS?

This app should do the trick.

• Has GPS functions
• Allows you to store and name multiple working locations
• Allows you to start, stop and set breaks on the timer.

How to use (from app description):

1. Download the app and wait till you arrive at your office.

2. Once there, activate the GPS tracking feature and go to the preferences page.

3. Register your current location as a working location (you can store more than one location for the same place, making the tracking more reliable).
4. Setup the amount of hours you plan to work (by default it is 8 hours).
5. If you leave the office before this amount of time expires, the timer will automatically enter in break mode (useful for lunch breaks)
6. When the timer reaches the planned working hours value, a ringtone will play and you will know that you can leave the office.

7. After the planned working time is passed, leaving the office will automatically stop the timer, and the working time info will be available in the history page.

8. After the initial setup you won't need to do anything else but keeping the app alive in background to keep track of your working time.

Another app that does this in a more generic, passive, long-term fashion is Placeme.

HoursTracker for iOS. Perfect. Excellent.

Location Awareness* clocks in for you when you arrive. *Optional in-app purchase $0.99.

I set my work location using 3G or Wi Fi. Then, every time I arrive near my work location the app clocks in. And every time I leave it clocks out.