Get pace, speed, distance, and more on your wrist. With SiRFstarIII GPS technology and ANT+ compatibility, this Ironman Global Trainer GPS watch from Timex records your performance across several dimensions--including pace, speed, distance, and more--providing real-time data on a customizable screen. The watch measures your location with altitude ascent and descent distances and rates, records up to 100 location waypoints to track back and create routes, and recalls up to 50 custom routes for pace tracking. The device offers six modes of operation including performance and multisport modes. The SiRFstarIII GPS technology requires no calibration.