I just saw a commercial for this watch, which sounds awesome for blading!

Here is the Amazon description of the awesomeness:

The technologically advanced Timex T5B501 Speed + Distance digital watch not only helps you monitor your sports training with a variety of sport timekeeping features, it also offers GPS tracking capabilities. With the included Navman I GPS sensor, you'll be able to precisely track how far and how fast you are running, biking, skiing, or rowing. The splash-resistant Navman has a 99 percent distance accuracy and features a continuous odometer and 28-hour battery life from 2 AA batteries. Tracking features include:
* Exact Speeds: Measures your real-time speed, average speed, and maximum speed
* Exact Pace: Calculates your pace, average pace, and best pace
* Exact Distance: Tracks your workout distance and give target distance alerts