From 100% full charge over a 32-day period, I used the Enduro in 18 combined Trail Run and Ride activities totalling 284km in 34:07:35 with 26% charge left enough to last another 33 days in watch mode or 19 hours of activity time. All activities in full GPS mode (Every Second Recording, GPS+GLONASS or GPS+GALILEO and Heart Rate). There’s more than enough battery life to handle more than a 100-miler event.
Stock functions removed or disabled include Activity Tracking, Pulse Oximeter, Widgets (ABC, Respiration, Stress, Body Battery, Hydration), Notifications, Bluetooth (turned on only for activity syncing), Watch face is stock Garmin.
Right out of the box, the Garmin Enduro reports overly generous total elevation gain numbers. I prefer my GPS watch to be accurate not generous. Before the Enduro I had been using the Fenix 3 HR for a number of years and its accuracy has been time-tested against so many ultra trail races I’ve ever been in. So I have a solid reference to compare the Enduro with. With that said, I suggest making the following changes:
The Enduro comes with three satellite options: GPS, GLONASS and GALILEO. By default it’s set to use only GPS with options to select GPS + GLONASS or GPS + GALILEO. For Trail Running activity it’s highly recommended to use GPS + GLONASS for increased tracking accuracy. This is a per activity setting.
■ Long Press MENU button | Settings | System | Data Recording | Every Second
■ Long Press MENU button | Settings | Sensor & Accessories | Altimeter | Auto Cal. | During Activity: OFF | Not During Activity: OFF.
When enabled, Auto Calibration “consistently results in weirdness like me apparently going below see level by 20 meters or running off small cliffs as auto cal kicks in and adjusts altitude. Leaving auto-cal off you set your known altitude (you can check on various websites (or use DEM only before activity) and then altitude during activity will depend only on baramoter. This approach gives by far the most sensible data for me so far, but if weather (pressure) changes during activity you see slight errors but nothing as bad as Auto-Cal.” (user on Reddit)
■ Long Press MENU button | Settings | Sensor & Accessories | Barometer | Watch Mode | Barometer (Default: Auto). I’ve found Auto jacks up elevation gain a lot and until a future firmware addresses this problem, the only way is to force Watch Mode to Altimeter (more info from Garmin).
Before starting an activity (I do this for Run, Trail Run and Ride) calibrate the Altimeter and Barometer manually by using data obtained from a reliable source: https://is.gd/BarometerPlus. App runs on my Google Pixel 3XL smartphone that uses a precision BOSCH BMP388 absolute barometric sensor ibit.ly/O2MK. An absolute barometer (as opposed to gauge and differential) is necessary for accurate local atmospheric pressure and altitude.
Three shades of tan from three separate runs while training for The Most Beautiful Thing 50K Ultra Trail Marathon the darkest of which a result of 8 hours under open sky covering a 40K distance between Agro Park and Bukit Shahbandar.