Whether you’re exploring a reef, paddling along the coast or heading into the mountains, your smartwatch needs to cope with far more than incoming notifications.
For divers and outdoor adventurers, it has become another piece of essential kit – helping with navigation, monitoring performance and recording every activity, while standing up to the harsh environments where ordinary smartwatches often struggle.
Founded in 2018, KOSPET specialises in rugged outdoor smartwatches designed for people who spend their time in demanding environments.
Its flagship TANK T4 and TANK M4 combine military-grade durability with dedicated diving, navigation and outdoor sports features, bringing many of the capabilities found in premium adventure watches to a more accessible price point.
Designed for life on, in and under the water
The flagship TANK T4 and TANK M4 have been designed with watersports firmly in mind. Rated to 10ATM and IP69K standards, they support swimming, watersports and recreational diving to a maximum depth of 45m (148ft).
Both models feature an integrated recreational dive computer using the Bühlmann ZHL-16C decompression algorithm, with support for air and nitrox diving as well as dedicated scuba, freediving and gauge modes.
During a dive, they provide the standard information recreational divers would expect, including no-decompression limits, ascent-rate monitoring and safety-stop guidance, while logging each dive for later review through KOSPET’s APEXMOVE app.
Both models have been independently certified by SGS to meet the US MIL-STD-810H military standard, having undergone testing for impact resistance, salt spray, humidity, thermal shock and temperatures ranging from -50°C to 70°C.
The TANK M4 combines its rugged construction with a large 1.96-inch AMOLED display protected by Corning Gorilla Glass 3, providing a bright, easy-to-read screen underwater, while four physical buttons offer an alternative to the touchscreen when wearing gloves or operating beneath the surface.
Navigation wherever your adventure takes you
Whether you’re diving from shore, exploring unfamiliar coastlines or hiking beyond mobile coverage, reliable navigation can be just as important as fitness tracking.
Both the TANK T4 and TANK M4 use dual-band L1 and L5 GNSS positioning designed to improve location accuracy, particularly in difficult environments where conventional GPS can struggle.
Offline maps can be downloaded directly to the watches, while GPX and KML route imports allow users to follow planned routes without requiring a mobile signal. A built-in Track Back function can guide users back to their starting point, whether returning to a trailhead, dive entry point or boat.
The watches also incorporate a digital compass, barometric altimeter and weather forecasting to help users keep track of changing conditions throughout the day.
Built for endurance
Battery life is often one of the biggest concerns for outdoor users, particularly during multi-day trips.
The TANK Series has been engineered to minimise charging, offering up to two weeks of typical use on a single charge while supporting a full day of continuous GPS tracking. An optional wireless power pack also allows cable-free charging while travelling.
Away from diving, the watches support more than 170 sports modes, including swimming, hiking, trail running and cycling, with health monitoring features such as heart rate, blood oxygen, sleep tracking and training analysis managed through the APEXMOVE companion app.
Two watches for different adventures
Although they share the same diving platform and many core features, the two flagship models have been designed with different users in mind.
The TANK M4 features a bold rectangular design with a large display that prioritises visibility and quick access to information during diving and other outdoor activities.
The TANK T4 adopts a more traditional circular watch design while adding advanced endurance sports features including heart rate variability (HRV), VO₂ max monitoring, cadence tracking and pace zoning, making it equally suited to trail running, hiking and triathlon training.
For those looking for a more refined appearance away from the water, KOSPET also offers a TANK T4 Special Edition featuring a black-and-gold finish while retaining the same rugged specifications.
KOSPET TANK T4 and TANK M4 key features
- Recreational scuba, freediving and gauge modes
- Bühlmann ZHL-16C decompression algorithm
- Air and nitrox support
- NDL, safety-stop and decompression-stop information
- Depth, ascent-rate and oxygen exposure monitoring
- 10ATM and IP69K waterproof rating
- SGS-certified to US MIL-STD-810H military standard
- Dual-band L1 and L5 GNSS positioning
- Offline maps with GPX and KML route support
- Track Back navigation feature
- Digital compass, barometric altimeter and weather forecasting
- Up to two weeks of typical battery life
- Compatible with the APEXMOVE app for iOS and Android
The KOSPET range
Today, KOSPET products are available in more than 100 countries, with the company’s TANK Series aimed at divers, swimmers, paddlers and outdoor athletes looking for a rugged smartwatch that combines dive computer functions, navigation, health monitoring and outdoor performance without the premium price tag.
www.kospet.com
