The COROS VERTIX 2 GPS adevnutre watch uses aviation-grade GPS and can run for months without a recharge.
COROS VERTIX 2 GPS ADVENTURE WATCH REVIEW, Best Running GPS Watches
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COROS VERTIX 2 GPS Watch
Track Your Adventures With the GPS-Heavy COROS VERTIX 2 Watch
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COROS VERTIX 2 Adventure GPS Watch, Ultra-Long 43 Days Battery Life, Dual-Frequency GPS, On-Wrist Navigation, Offline Maps, Heart Rate Monitor, Track Sleep, Running, Biking, Skiing, Climbing-Obsidian : Electronics
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Coros Vertix 2 announced: New adventure watch with improved GPS, onboard music, and extreme battery life