13 Reasons Why I Love My Forerunner 305 - Version 1.0 13 Reasons Why I Love My Garmin Forerunner 305. 1. The Look of Garmin Forerunner 305; 2. The Display Screen of Garmin 305; 3. Layout of Buttons on Garmin 305; 4. Power Charging & Data Transfer Function of Garmin 305; 5. Tracking Function of Garmin Forerunner 305; 6. GPS Function of Garmin 305; 7. Data Capturing Function of Garmin 305; 8. Data Display Function of Garmin 305; 9. Heart Rate Monitoring Function of Garmin Forerunner 305; 10. Virtual Partner function of Garmin 305; 11. Interval Workout Function of Garmin 305; 12. Performance Analysis Function of Garmin 305; 13. Garmin Forerunner 305 is Waterproof & Easy to Use.