The Suunto Ambit 2 S HR offers durability & precision. Advanced features suit both on & off-season activities for the hardcore explorer. Features Full-featured GPS with Waypoint & route navigation Unique 3D compass Accurate barometric altitude Barometer Temperature Global & local GPS grids Highly responsive pace & speed (Fused Speed) with accelerometer integrated GPS Accurate vertical speed with barometric altimeter Advanced heart rate monitoring with Peak Training Effect & Recovery Time Online sports diary with planning & analysis tools in Movescount.com Compatible with Suunto Foot, Bike, Road Bike, & Cadence PODs Glossary Fused Speed A unique combination of GPS & acceleration sensor readings for more accurate running speed. The GPS signal is adaptively filtered based on acceleration, giving a more accurate reading at steady running speeds & a quicker response to changes in speed. Fused speed is meant for running & similar types of sports only.