Introduction
The KOSPET TANK T4 aims to combine a wide range of sport, outdoor and aquatic functions in one watch without the price of premium models. This review combines the official specifications with real underwater tests: 30 metres on scuba and 26 metres while freediving, with no problems encountered. On scuba, the watch correctly logged the entry and exit coordinates. Its main strength remains its versatility for the price, while claims beyond our test conditions remain manufacturer specifications.
One rugged watch for many activities
The TANK T4 targets people who move between daily training, hiking, trail running and water activities. Its large round case and silicone strap clearly favour a rugged outdoor look. It may suit users who prefer one device on the wrist instead of several specialist watches. KOSPET says that 23 ApexMotion modes provide advanced data, while 160 freestyle modes cover a very broad range of activities. That quantity does not ensure the same analytical depth as a premium ecosystem, but it does strengthen the watch’s features-to-price proposition.
Display, design and durability
According to KOSPET, the 1.43-inch AMOLED display reaches up to 1,000 nits and includes an ambient-light sensor, which should support outdoor readability. The manufacturer also highlights a stainless-steel Inox 360 structure and testing against 20 MIL-STD-810H standards. These claims support its rugged positioning, although they do not replace our own durability testing. The watch is visibly substantial: this can help screen legibility and protection, but buyers with smaller wrists should consider its size and weight before choosing it.
GPS, maps and sport functions
KOSPET advertises dual-band, six-system GNSS, offline maps and GPX or KML route import through Apexmove. This makes the T4 interesting for runners, hikers and trail users who want route guidance without constant phone access. Its 32 GB storage is intended for maps and music, although usable capacity will be lower after system files. With 23 ApexMotion modes and 160 freestyle modes, sport coverage is extensive. GPS accuracy, route handling and the quality of post-workout analysis still need to be confirmed across varied terrain and longer use.
Battery life and everyday use
The manufacturer claims up to 14–15 days of typical use, 9–10 days of heavy use, 5–6 days with the always-on display and 21–22 hours of continuous GPS tracking. Actual results will vary with brightness, sensors, GPS, music and notifications. Read cautiously, these figures still suggest useful endurance for outdoor weekends and for anyone who dislikes nightly charging. Apexmove manages maps, routes and activity data, with Strava synchronisation also advertised. Its software ecosystem is broad, but it is not yet as established as those of the market leaders.
Freediving, scuba and aquatic activities
We tested the aquatic functions in real conditions down to 30 metres on scuba and 26 metres while freediving, with no problems encountered. On scuba, the watch correctly logged the dive entry and exit coordinates, together with the session data we observed. These results are very encouraging for recreational use. KOSPET advertises three dive modes, 10 ATM and IP69K resistance, and use down to 45 metres. Users should still follow the manual and operating limits and avoid hot water or saunas. A dedicated dive computer remains the reference for advanced or technical diving.
Who is it for, and what are the limits?
We mainly recommend it to versatile athletes who want many functions at a contained price: running, gym, hiking, trail, music, navigation and aquatic activities. Our 30-metre scuba and 26-metre freediving tests ran without problems and reinforce its excellent value for money. Athletes who need highly advanced metrics or a particularly mature training ecosystem should still compare it with more expensive specialist devices. Our score includes these initial real-world tests and may evolve after prolonged use.
Our rating — real-world test
4.3 / 5This score takes into account real-world tests down to 30 metres on scuba and 26 metres while freediving. We encountered no problems during these dives. On scuba, the watch correctly logged the entry and exit coordinates, together with the session data we observed. The overall 8.6/10 corresponds to approximately 4.3/5. Longer testing will still help assess reliability over time.
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