Ultra Trail Bosques del Sur 2026
Which GPS watch for Ultra Trail Bosques del Sur
For Ultra Trail Bosques del Sur, what really matters in a watch is that the battery lasts to the finish. We estimate a mid-pack runner's time and recommend the watch whose battery covers it with margin.
Our recommendation
Garmin
Garmin Forerunner 965
Premium running watch with a 1.4" AMOLED display, onboard topo maps, multi-band GPS and music. Up to 31 h in GPS mode (19 h multi-band) and 23 days in smartwatch mode, at just 53 g. Garmin's top running watch without the bulk of a Fenix: ideal for marathons and single-day ultras with accurate navigation.
Why this watch
Ultra Trail Bosques del Sur is an ultra: you'll finish in around 16h 25min. Your watch must record at least 21 h of GPS without recharging. Prioritise battery life and, if needed, drop to standard GPS mode to reach the finish with charge to spare.
Other options to consider
Polar
Polar Pacer Pro
Ultra-light running watch (41 g) focused on power-based training and Polar's running metrics. 35 h of battery in GPS mode and breadcrumb navigation. Simple, thin and comfortable, with one of the best training-analysis platforms for road and light-trail runners.
Coros
Coros Pace 3
Trail running GPS watch with track navigation, barometric altimeter and up to 38 h battery life in GPS mode. Lightweight (39 g), accurate and with offline maps. Best value for mountain navigation.
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