OKM Rover UC: the undercover scanner
The OKM Rover UC ("UC" stands for Undercover, per OKM) looks like a carbon trekking pole. The telescopic probe adjusts from 670 to 1380 mm and weighs about 0.5 kg. Control and live scan images run on an Android smartwatch with the OKM app pre-installed, and the same app also runs on an Android smartphone if you want a larger screen. The watch can show a pedometer and heart rate, so the Rover UC passes as fitness gear. OKM states the Rover UC is ready to use without a computer for first measurements, and you transfer scans to the included notebook for 3D analysis.
The Rover UC has three modes: Magnetometer, Pinpointer and 3D Ground Scan, with basic discrimination between ferrous metal, non-ferrous metal and cavities. Feedback comes through sound, the watch screen, a small display on the handle, and vibration if you switch it on. OKM rates the built-in battery at about 48 hours per charge, charged by USB-C in about 3 hours. OKM says the sensors become more sensitive as you extend the probe.
The current Rover UC (OKM calls it the 2022 version) replaced the earlier Rover UC sold from 2011 to 2021, which ran on AA batteries with a smartphone. As of October 2026, OKM's current package adds the smartwatch, Bluetooth headphones, a pre-configured Windows notebook with Visualizer 3D Studio Standard Edition and a waterproof, shock-resistant protector case, and still includes a carrying bag.
OKM Rover C4: two probes and four modes
The OKM Rover C4 is a handheld control unit (about 1.5 kg) with a 3.5-inch color touchscreen, backup hardware buttons, adjustable LED lighting underneath for dark tunnels or night work, and four memory areas for scan data. It ships with two probes, and the probe sets what you can do:
Standard Probe (0.4 kg, 445 mm): attaches straight to the control unit and runs 3D Ground Scan and Magnetometer. It is the light, all-in-one way to carry the Rover C4.
Super Sensor (0.9 kg, 960 mm): connects by cable and is carried separately. It runs all four modes, including Pinpointer and Mineral Scan, and OKM states it gives higher resolution 3D scan images.
Both probes have OKM's LED Orbit, a ring of lights that shows detected metals and voids in different colors during the scan. Mineral Scan is the Rover C4's gold-prospecting mode: OKM says it is used to locate natural gold deposits. We do not treat it as a nugget detector. The package also includes Bluetooth headphones, a pre-configured Windows notebook with Visualizer 3D Studio Standard Edition, a protector tube and a waterproof, shock-resistant protector case.
How deep OKM rates the Rover
OKM gives Rover depths as objects its customers have found, not as a tested specification: down to 20 m (65 ft) with the Rover UC and down to 25 m (82 ft) with the Rover C4. Those figures apply to large objects and voids. Small targets such as coins show at far shallower depths, and soil, target size and scan technique all change the result. Our guide How Deep Do Metal Detectors Go? explains why.
Weather, accessories and what does not fit
Neither OKM Rover is waterproof, so plan scans for dry weather and carry the unit in its case. The Rover UC operates from minus 5 to 60 °C (23 to 140 °F) and the Rover C4 from minus 10 to 60 °C (14 to 140 °F), according to OKM. Rover probes are OKM's own sensors and the Rover has no conventional search coil, so coils and coil covers made for other detectors do not apply. The Rover UC and Rover C4 do not share probes: the Standard Probe and Super Sensor belong to the Rover C4. For digging on a scanned target, a pinpointer such as the OKM Fortuna XELA narrows the hole.
Rover UC or Rover C4: the question we ask first
When a customer calls about the OKM Rover, we start with one question: will you be walking in with the scanner in plain view, or not? If you need to search without drawing attention and want a unit OKM calls extremely lightweight, at about 0.5 kg, the Rover UC is the one, as long as three modes and a watch screen are enough. If carrying a visible instrument is no problem, the Rover C4 gives you the on-unit touchscreen, the higher resolution Super Sensor and Mineral Scan for gold ground, with a control unit of about 1.5 kg.
A few buyers turn out to need something outside the Rover series. Someone who wants a VLF search coil for shallow metal built into a 3D scanner is better off with the OKM Evolution NTX. Someone happy to scan with a phone or notebook and wanting the lowest cost into OKM 3D scanning should look at the OKM Fusion series. Someone surveying large open areas will cover them faster with the OKM eXp 5500, which scans with up to five sensors at once. Imaging systems from other makers are in our 3D imaging metal detectors.
