The COROS VERTIX 2 GPS adevnutre watch uses aviation-grade GPS and can run for months without a recharge.
COROS Vertix 2 Adventure Watch - Ultra Running Magazine
COROS VERTIX 2 GPS Adventure Watch Obsidian - Description
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
COROS VERTIX 2 GPS Adventure Watch review
Reviewed: The New Coros Vertix 2 Smartwatch – Triathlete
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Coros Vertix 2 review
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