Item: CHASING GLADIUS MINI S Underwater Drone
Rating: 4.7
Author: Global Drone HQ

The CHASING GLADIUS MINI S sits at the intersection of two categories that rarely overlap: genuinely portable and genuinely capable. At $2,499, it is the system that serious underwater photographers, hull inspection operators, and marine researchers reach for when they need 100m depth, 4K video, and a 4-hour run time without needing a dedicated topside operator to manage a complex deployment. This review covers who it is for, what the specs mean in practice, and where it fits in the CHASING lineup.

View the CHASING GLADIUS MINI S on Global Drone HQ

Who Is the GLADIUS MINI S For?

The GLADIUS MINI S is designed for the operator who has outgrown entry-level depth limits and wants professional output without the workflow complexity of a full industrial system. That typically means:

Underwater videographers and photographers shooting reef content, wreck footage, or marine life documentation for professional or social media audiences
Boat owners and marine surveyors who need to inspect hulls, keels, props, thru-hulls, and running gear down to 100m without hiring a diver
Marine researchers and biologists conducting visual surveys of benthic habitat, reef condition, or species distribution
Dive instructors and dive shops previewing and marketing dive sites
Offshore anglers scouting deep structure beyond the range of entry-level ROVs

It is also a strong choice for anyone who wants a single ROV that handles both recreational and light commercial use. The specs that make it excellent for weekend reef photography are the same specs that make it legitimate for professional hull survey work.

Key Specs

Depth rating: 100 m (328 ft)
Camera: 4K UHD wide-angle with Electronic Image Stabilization
Battery: Up to 4 hours
Speed: Up to 2 m/s
Thrusters: 6 (4 horizontal + 2 vertical)
Lighting: 2 x 1,000-lumen LEDs (2,000 lm total)
Standard tether: 15 m (expandable with CHASING E-Reel to 100m or 200m)
Compatible accessories: Floodlight 2.0, CHASING E-Reel
Price: $2,499

Camera: 4K UHD with Electronic Image Stabilization

The jump from 1080p to 4K is not just a resolution number -- it is the difference between footage you can deliver to a client and footage that reads as amateur. The GLADIUS MINI S shoots 4K UHD through a wide-angle lens, and the Electronic Image Stabilization (EIS) system actively corrects for the micro-movements that come from thruster pulses, slight current, and tether tension. Stabilized 4K footage is what separates usable professional deliverables from shaky underwater clips.

For hull inspection specifically, stabilization matters because an unstable camera makes it difficult to identify hairline cracks, osmotic blistering, or antifouling paint degradation in post-review. A stable, steady pan along the waterline is what an insurance surveyor or marina needs to see. The GLADIUS MINI S produces that consistently.

Battery: 4 Hours Is a Standout Number

Most prosumer ROVs in this category run 2 to 3 hours. The GLADIUS MINI S's 4-hour battery is a genuine differentiator. A typical professional hull survey runs 45 to 90 minutes depending on the vessel size. A full offshore reef video session runs 1 to 2 hours including navigation time. Four hours covers both of those in a single charge, with reserve left over.

For light commercial operators who do multiple inspections in a day, four hours means you can run two or three full surveys without returning to shore to charge. That is the kind of operational efficiency that directly affects your revenue per day on the water.

Depth: 100m Opens the Real Ocean

The difference between 15m and 100m is not a step change -- it is a complete category change. Fifteen meters is harbor, dock, and shallow reef. One hundred meters is the continental shelf, deep offshore structure, wreck sites, and the kind of marine habitat that most people have never seen with their own eyes. The GLADIUS MINI S operates throughout that entire depth range on a 15m standard tether (extend to 100m or 200m with the CHASING E-Reel).

For practical purposes, most GLADIUS MINI S users will spend the majority of their time in the 10 to 50m range. The 100m rating is reassurance and occasional capability, not a day-to-day operating depth. The fact that the system can go there if needed is what makes it a long-term investment rather than a product you outgrow in a season.

Six Thrusters: Capable, With One Real Limitation

Four horizontal thrusters handle forward, backward, and lateral movement. Two vertical thrusters handle ascent, descent, and depth hold. This six-thruster configuration delivers solid all-around control in calm to moderate conditions. The limitation shows up in current: in a tidal sweep or river current above roughly 0.5 m/s, holding a precise position on a structural element becomes difficult. The vehicle tends to weathervane slightly, requiring continuous correction from the pilot.

If your primary environment involves significant current -- tidal harbors, river mouths, offshore surge zones -- the CHASING M2 S with its 8-thruster vector layout and C-Sense AI stabilization is a better fit. For calm to moderate conditions, the GLADIUS MINI S handles everything you will encounter.

Lighting: 2,000 Lumens for the 0 to 50m Range

Two 1,000-lumen LED arrays deliver 2,000 lm total illumination. This is sufficient for the 0 to 50m range where ambient light still provides some contribution. At depths approaching 100m in clear water, ambient light is essentially zero and 2,000 lm begins to show its limits -- the field of illumination narrows and dark areas at the edges of the frame become more pronounced. CHASING offers the Floodlight 2.0 as an add-on accessory for operators who regularly work at depth and need supplemental illumination.

Accessories and Expandability

The GLADIUS MINI S supports two key accessories:

CHASING Floodlight 2.0: Supplemental LED lighting for deep or low-visibility work
CHASING E-Reel 200m: Electric tether winder that replaces 15m standard cable with 200m managed tether, eliminating tangles and extending your operational range significantly

For anyone doing regular deep dives beyond the 15m standard tether, the E-Reel is a near-essential accessory. Managing 100m+ of free tether by hand on a boat deck is a significant operational overhead that the E-Reel eliminates entirely.

GLADIUS MINI S vs CHASING DORY: Which One Do You Need?

The DORY is the right choice if you are operating in shallow water (under 15m), prioritize portability above all else, and do not need 4K footage. At $1,299, it is also the right entry point if you are not sure yet how much you will use an ROV.

The GLADIUS MINI S is the right choice if you know you need 100m capability, 4K video, or extended run time for professional or semi-professional work. The $1,200 price difference buys a fundamentally different system -- not just a better version of the DORY.

GLADIUS MINI S vs CHASING M2 S: When to Step Up

Both reach 100m and shoot 4K. The M2 S adds two more thrusters, C-Sense AI stabilization, Anti-Stuck Motor technology, and accessory compatibility (Grabber Arm 1.0). The M2 S also supports longer standard tether runs (100m or 200m included, versus 15m on the GLADIUS MINI S).

If you are a commercial operator, working in current, need to add sensors or a grabber, or want a system with a path to professional certification and deliverable-grade documentation, the M2 S is the right tool. If you are an advanced recreational user or light-commercial operator working in calm conditions, the GLADIUS MINI S covers more ground than you will need at a lower price point.

Bottom Line

The CHASING GLADIUS MINI S delivers the most capability per dollar of any ROV in the current market at its price point. Four-hour battery, 4K EIS camera, 100m depth, and a solid 6-thruster control system cover the vast majority of underwater photography, hull inspection, and marine research use cases without the operational complexity or cost of a full professional system.

It is the ROV we recommend most often at Global Drone HQ to buyers who are serious about underwater work but not running a commercial inspection business. If that describes you, start here.

Buy the CHASING GLADIUS MINI S -- $2,499

CHASING GLADIUS MINI S Review 2026: Best Prosumer Underwater ROV?