The Forerunner 101 Wrist GPS Navigator offers athletes and recreational walkers and runners an entry-level personal training device with GPS. It measures speed, distance, pace and calories burned. It stores lap histories for up to two years to provide an archive of workout performance over time. Retrieve lap data for previous workouts by date, week, month, or over a specific time interval. Working out with the Forerunner 101 Wrist GPS Navigator means you're never alone in your personal training, because the unit provides a \"Virtual Partner\". This unique feature allows you to set your training goal by configuring your Virtual Partner's pace and workout distance. You'll get a graphic perspective of your performance by viewing your pace in relation to your Virtual Partner's pace, so you can always see at a glance if you're keeping up or falling behind.