g-tac pro

g-tac pro uses the accelerometer and GPS in iPhone or iPod touch to track and record the performance of your vehicle at the circuit or the drag strip.

Response to scareyourpassenger's review:
Google maps is *not* more accurate. Maps often misplaces your position by 100's of yards briefly and then snaps back. g-tac pro won't do that, but that also means you have to wait for an accurate gps lock which can take a minute or two. If you start without waiting for a lock it says "no gps". It's not a hardware connection problem. Also, the exported data *is* in CSV format. Apple's mail app doesn't allow 3rd party apps to create emails with file attachments, so the CSV data is placed in the email body. Just cut and paste into a file.

Features:

- Record and playback a circuit lap
- Export raw GPS and accelerometer data
- Analyze acceleration/brake and shift points
- Animated graph of traction circle, lateral and
accel/brake Gs
- Video scrubber controls for lap playback
- 0 to 60mph (100km/h) time
- 0 to 100mph (160km/h) time
- Quarter mile (400m) time and trap speed
- 60mph (100km/h) to 0 stopping distance
- 0-100mph-0 (0-160km/h-0) time
- Horsepower calculator
- G-meter for max accel/brake and lateral Gs
- Comparison graph of up to three drag passes
- Improved accuracy using GPS on iPhone 3G
- Typical accuracy of 1mph (1-2km/h)

And remember to drive that car like you stole it.

更新履歴
UI improvements
minor bug fixes for graphs