Time, date, alarm, timer, stopwatch, sunrise/sunset
GPS time synchronization
Health monitoring: heart rate, respiration rate and others
GPS, GLONASS, Galileo
Gyroscope
Compass
Thermometer
Garmin Coach: free running programs and running coach
Accelerometer
Pulse Ox sensor
Safety and tracking features
Sleep monitoring, relaxation, stress tracking, fluid intake
Pedometer, calories burned, etc.
Fitness equipment/studio functions
VO2max display
Running functions, running profiles, running workouts
Cycling functions
Golf functions
Outdoor recreation functions: Hiking, indoor climbing, bouldering, mountaineering, mountain biking, skiing, snowboarding, cross country skiing, stand up paddling, rowing, kayaking, surfing, jumpmaster, tactical operations, expeditions
Swimming functions
Music functions
Phone functions