Look for Garmin Fenix 3. It a bit expensive, but a great watch. It has two GPS (one of them in Glonass) and provide more than 50 hours of battery life while not in running use. It also has all those fancy features (sleep, activity, step count etc.) Recently, I did a 50 miler (in ~13 hours) with both GPS on, and the watch battery lasted. Indeed, the watch had 14% batter still unused. The watch can also be used for triathlon, skiing, climbing and other outdoor activities (its also water proof). I can see for a an athlete this is a true watch to explore.
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Look for Garmin Fenix 3. It a bit expensive, but a great watch. It has two GPS (one of them in Glonass) and provide more than 50 hours of battery life while not in running use. It also has all those fancy features (sleep, activity, step count etc.) Recently, I did a 50 miler (in ~13 hours) with both GPS on, and the watch battery lasted. Indeed, the watch had 14% batter still unused. The watch can also be used for triathlon, skiing, climbing and other outdoor activities (its also water proof). I can see for a an athlete this is a true watch to explore.