The Garmin International Forerunner 305 GPS tracks your every move with a super-sensitive GPS that even works on tree-covered trails and near tall buildings. The Forerunner 305 GPS continuously monitors your speed, distance, and pace so you can train smarter and more effectively. It has all the advantages and technologies of the Forerunner 205 with the addition of a wireless Heart Rate Monitor that allows you to keep the intensity of your workout under control. The Garmin Forerunner 305 is your trainer, your information source, and your analystit tracks your physical ability, progress, objectives, mapping, and calories burned.