Garmin Forerunner 935 UltraTrac mode: an incredibly fun battery test | TechRadar
GPS Mode vs UltraTrac: A Guide to Maximising Your Garmin Watch Battery
Garmin Enduro, Ultraperformance Multisport GPS Watch with Solar Charging Capabilities, Battery Life Up to 80 Hours in GPS Mode, Steel with Gray UltraFit Nylon Band Steel with Gray UltraFit Nylon Band GPS
see ultra-trac image - wild variation - fēnix 5 Series - Wearables - Garmin Forums