I first heard about GPS lap timers from an engineer friend. The technology isn't rocket science, the service is free..... It doesn't require set up of transponders and like the unit that helps you find your way around, it can map out your track and show you where you are in relation to that map.
That's where the magic of the GPS lap timer comes in. With minimal effort beyond switching it on and pushing some more buttons to set it up, you can get a map of the track and useful information sush as current speed, lap times, RPM, Max speed, fastest speed, and even your deceleration and acceleration point.
That will prove to be a very useful learning tool. Your racing line and approach to a track can gradually be improved upon.
These devices ,however, cost a pretty penny. I decided to look online to see what the alternatives are until i can afford the real Mc coy.
Enter the IPHONE LAP TIMER:
There is a program created by someone that allows any GPS enabled device to act as a GPS lap timer. It even works on your IPHONE.
http://www.schlangmann.mynetcologne.de/HarrysLapTimer/
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Also check this out, not as many features as Harry's, but for windows mobile: www.ilaptiming.com
The reason the dedicated GPS based lap timers are so expensive is that the GPS chip used has a higher update frequency. The typical consumer GPS is 1hz (updating 1x per second). The GPS lap times have 7hz or 10hz GPS chips which are very expensive. The benefit is more acurate information, think about how much ground you cover in a second... Don't get me wrong though, I love even 1hz GPS timing and all the data it provides!
Here's one for Android:
http://trackmaster.trackaroo.com
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