This might be usefull to track your speed

Not bad here's a a piece from the website;

How far? How fast?
Utilizing renowned GPS technology, the Timex® Ironman* Triathlon® Speed + Distance System utilizes a network of global positioning satellites to precisely track how far and how fast you are running, biking, rowing or skiing. Anytime. Anywhere in the world.
Learn about the different features of the Speed + Distance System with our product tour or test drive the Speed + Distance System with our interactive test drive (Requires the Shockwave player)
The Timex® Ironman* Triathlon® Speed + Distance System is part of the Timex® Bodylinkâ„¢ System and is also compatible with the Timex® Data Recorder.
Timex Data Recorder
It’s the ultimate training log for all athletes. The Timex® Data Recorder collects precise information from your Digital Heart Rate Sensor, Speed + Distance Sensor, or both devices at the same time. Through the simple USB connection, data can be later downloaded to your PC, and used with Timex® Trainer software to chart your progress, achieve your goals, and maximize your workouts.
EXACT SPEEDS
Measures your real-time speed, average speed and maximum speed.
EXACT PACING
Calculates your pace, average pace and best pace.
EXACT DISTANCES
Tracks your workout distance. Also functions as a continuous odometer.




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Called sport chalet, they want $300.00.  Plus I wonder how well it'll function at 200mph  
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