Water resistant to 130m, the Mission3 offers vibration and sound alerts for safety. With patented functions like GPS dive spot navigation and a freedive safety stopwatch, it also includes apnea training tools, multi-band GPS, a digital compass and a 1.4-inch full-colour AMOLED display. Paired with the handy Atmos logbook app, the Mission3 is suitable for divers of all levels. Modes include Air, Nitrox, Multi-Gas, Gauge, Freedive, Pool, and STA. Other features include CO₂/O₂ tables, customisable watch faces, upgradeable firmware and a quick-release watch strap.

The Mission3 dive computer measures 50 x 50 x 14.8mm and weighs 83g (with its silicone watch band). It has a mica glass lens, 1.4″ full-colour AMOLED display, 454 x 454-pixel display resolution, stainless steel bezel and buttons, fibre-reinforced polymer case, and 26mm-wide quick-release silicone strap. It is powered by a factory-replaceable lithium-ion battery with up to 14 hours battery life and a USB Type-C/5V-9V DC/3A charging method. Other features include metric and imperial units, 1000-log memory, time and date, daylight savings time, alarm clock, stopwatch, timer, sunrise and sunset times, iPhone and Android smartphone compatibility, smart notifications, weather, tide tables, GPS (GLONASS, BDStar and GALILEO), barometric altimeter,  gyroscope, accelerometer, thermometer, and depth sensor. Languages include English, Korean, Japanese and Chinese.

Scuba

Scuba modes include Single Gas (Air, Nitrox O₂ up to 40%), Multi-Gas (2 Gasses, Air, Nitrox O₂ up to 50%), and Gauge (bottom timer). It uses a Bühlmann ZHL-16c (GF configurable) decompression model. Additional features include PO₂ (up to 2.0), auto start dive, safety stop, descent/ascent rate indicator, dive planner, custom dive data screens, reset residual tissue loading, and several alarm methods, including visual, vibration and audible buzzer. Scuba alerts and alarms include Fast Ascent, Safety Stop, Low NDL, Deco Stop, Deco Stop Ceiling Violated, Dive Time, Depth, MOD, CNS, Surface Interval Notify, Check SPG Reminder, and Low Battery. Other functions include End Dive Time (20 seconds to 10 minutes), 3-Axis Dive Compass (with lock heading), Dive Stopwatch, Save Entry and Exit GPS, Add Dive Spot GPS, GPS Dive Spot Navigation, No Fly Time, Surface Interval Time. 

Freediving

There is a Freedive Mode and Freedive Pool Mode. Apnea training tools include STA, CO₂/O₂ Tables, Custom Tables, and Dynamic Training. Freedive alerts and alarms include Dive Time, Descent Depth/Ascent Depth (10 sets each), Freefall Depth, Surface Time, Hydration, and Freedive Safety Stopwatch.

Intervals

Last but not least, there is a Step Counter, with Step Goal, Distance Traveled, and Calories Burned, plus Sleep Tracking.