The Forerunner 201 is the first all-in-one personal training device that uses GPS satellites to calculate speed, distance and pace. There's no calibration required, and Forerunner's extremely easy to use, so you'll be off and running in no time. You don't even have to think about starting and stopping the timer or punching the lap button to record stats. Forerunner will do it automatically. And when you need motivation, Forerunner's Virtual Partner feature lets you input pace, time and distance goals, and then shows if you're ahead or lagging.