The Cantrell Motorsports Lap Timer Pro is the easiest to use GPS-based lap timer, data recorder, video recorder, and performance analysis app available for iOS devices.

The app does not need any track information to function fully; it automatically learns the track and picks a suitable start/finish location, which can change later if desired.

⎟ Main Features⎢

• No setup or calibration is required!
• Automatic data and video recording; simply open the app to the Recorder screen and drive!
• HD Video on devices that support it (iPhone 4+, iPod Touch (Gen4), iPad 2+)
• Real-time display of speed, g forces, and lap times
• Immediate analysis of performance data and video at the track
• Lap and segment times
• Horsepower graph
• Automatic track mapping; no need for predefined track info
• High resolution GPS (upto 10Hz) using an external GPS module
• OBD2 data recording (using optional OBD2 modules)
• Designed for auto-crossing, road racing, drag racing, karting, motorcycle racing, bicycle racing and more...
 • Data sharing via Bluetooth (device to device at the track!), e-mail, and iTunes File Sharing
 • Share and compare lap times using the CMS Cloud Service

⎜ Overview of Operation ⎟

Recorded data is saved as Runs. Each Run starts when the vehicle exceeds 20MPH/33KPH and ends when the vehicle is moving slowly. The run includes several seconds of data before the recording trigger speed is reached. This way the start of an auto-cross run is included.

⎜ External GPS Modules ⎢

Due to limitations of the iTouch built-in GPS module, the data may suffer from inaccuracy. For iPhone 3GS and 4, the use of the built-in GPS is intended for demostration purposes only. An external GPS module is required for high speed driving for these iPhones. An external GPS module is optional for increased accuracy for iPhone 4S and 5.

• Refer to the user guide for additional information:

http://cmslaptimer.com

• Also Available: cmsAnalysis for the Mac

cmsAnalysis for the Mac provides the same data analysis for the Mac as is provided in CMS Lap Timer Pro. It is a free companion to the CMS Lap Timer Pro and is available here:

http://cmslaptimer.com/products.html