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CMS Lap Timer Pro

By Pete Stoppani

This app is only available on the App Store for iOS devices.


The Cantrell Motorsports Lap Timer is the app for the race track enthusiast seeking to improve via learning and sharing.

This 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 require any track information to function fully right out of the box. Simply mount it in your vehicle and the app uses GPS to automatically learn the track and pick a suitable start/finish location, which can be change later if desired.

This Pro version includes all of the free version's in-app purchase options at a reduced price.

Main Features

• No setup or calibration is required! Just mount and go!
• Automatic data and video recording; simply open the app to the Recorder screen and go!
• HD Video on devices that support it
• GoPro action camera auto on/of and auto record
• Pebble smart watch app available for status and manual record
• 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 such as the GoPoint BT1)
• 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
 • Export CSV files for use with apps such as RaceRender

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 built-in GPS module, the data may suffer from inaccuracy. An external GPS module is recommended for improved accuracy.

Continued use of GPS running in the background can dramatically decrease battery life. Use of a power adaptor is highly recommended.

• Refer to the user guide for additional information:

• 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:

What's New in Version 2.15

Fixed crash when showing list of runs.


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CMS Lap Timer Pro
View in iTunes
This app is designed for both iPhone and iPad
Offers Apple Watch App for iPhone
  • $14.99
  • Category: Sports
  • Updated:
  • Version: 2.15
  • Size: 19.5 MB
  • Apple Watch: Yes
  • Language: English
  • Seller:

Compatibility: Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

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