Marking Laps by Distance
You can use Auto Lap® to mark a lap at a specific distance automatically. This feature is helpful for comparing your performance over different parts of an activity (for example, every 1 mile or 5 kilometers).
Each time you complete a lap, a message appears that displays the time for that lap. The device also beeps or vibrates if audible tones are turned on (General Settings).
If necessary, you can customize the data pages to display additional lap data (Customizing the Data Pages).