Access multiple global navigation satellite systems (GPS, GLONASS, and Galileo) for tracking in more challenging environments than with GPS alone. Train smarter with VO2 max, an indicator of how well you can predict performance. This metric also takes into account changes in performance that may be caused by heat or altitude. As you run, analyze your pace, heart rate, and heart rate variability for a real-time assessment of your current ability to perform. Get up to 2 weeks of battery life in smartwatch mode and 10 hours in GPS mode with music. Use UltraTrac™ mode to make sure you have enough juice to get through your longest race. Whether you're running city streets or riding heavily covered trails, the Forerunner 945 provides built-in maps to help keep you on track.
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