How a Geoelectric Water Detector Works
The OKM GeoSeeker sets electrodes in the ground along a line. In an active measurement, two electrodes inject current and two measure the voltage, and the instrument calculates the apparent resistivity of the ground at each scan point. Water and water-bearing gravel conduct electricity well and show low resistance; cavities conduct poorly and show high resistance. Each scan point takes at least 16 seconds to measure. OKM covers the GeoSeeker with a 2-year guarantee.
Because the method reads resistivity, the GeoSeeker does not find coins, relics, gold or any other metal object. If metal is your target, see the OKM 3D ground scanners in the OKM Fusion series and OKM Rover series, or a conventional metal detector.
The OKM GeoSeeker System
The GeoSeeker is a two-unit system: a controller run from an Android tablet, and a power box that sends the current, with long cable drums. In Active Scan you set a start and end depth anywhere from 5 m (16 ft) to 250 m (820 ft), and results appear in 3D. We recommend the GeoSeeker when you need to survey deep, set a precise depth window, or want report-ready software.
GeoSeeker, Best For:
- Well builders and drilling contractors siting deep wells
- Finding flowing underground water
- Survey work that ends in a written report for a client
The OKM GeoSeeker in the Field
The GeoSeeker has three scan modes. Active Scan (Accurate) injects current through two electrodes and measures with two more, for water deposits, caves and impervious layers. Active Scan (Quick) is a faster version of the same measurement. Passive Scan reads the ground's natural voltage with two electrodes, without injecting current, and OKM says it detects flowing water only. Results can be analyzed further on a computer in the included Visualizer 3D Studio Professional Edition.
The controller runs at least 16 hours on charged batteries. The power box weighs 15.8 kg (34.8 lb) and runs about 100 hours at minimum power, 40 hours at average power and 8 hours at maximum, so plan the power level around the length of your survey day. OKM's GeoSeeker kit holds the controller with charger, eight rechargeable AA batteries, an Android tablet, four electrodes, two power cable drums with 26 m (85 ft) of cable each, two voltage cable drums with 255 m (837 ft) of cable each, two 2 m connecting cables, a USB flash drive with Visualizer 3D Studio Professional Edition, the PP20V3A01 power pack, the power box with charger, a waterproof and shock-resistant protector case and a quick start guide. OKM offers a pre-configured Windows notebook as an option.
What a GeoSeeker Result Tells You
The GeoSeeker is a survey instrument that gives a resistivity picture of the ground, not a guarantee of water. We suggest customers treat a result as the reason to drill in one spot rather than another, and read the depth figures, which are OKM's ratings, as the maximum the system is built to measure. The GeoSeeker colors the result: water-bearing gravel and the groundwater level show in blue, and cavities, caves, tunnels, chambers and impervious layers show in reddish colors. Different ground can give similar readings, so local geology still matters. The GeoSeeker reads a cavity as a high-resistance zone; cavity searchers who want to see the structure itself as an echo image should compare the OKM Gepard GPR in the table below, and for voids behind walls, the thermal probe on the OKM Delta Ranger is built for that.
Compare OKM Radar and Water Detectors
| Feature | Gepard GPR 3D | GeoSeeker |
|---|
| Method | Ground-penetrating radar, 60 to 300 MHz | Geoelectric resistivity |
| What it finds | Structures, cavities, pipes and large objects, metal or not | Groundwater, water-bearing gravel and cavities; no metal |
| Depth OKM gives | Up to 40 m (131 ft) | 5 to 250 m (16 to 820 ft) in Active Scan |
| Modes | 3D Ground Scan, 2D Radargram | Active Scan (Accurate), Active Scan (Quick), Passive Scan |
| Control and results | Supplied Android tablet, live display | Supplied Android tablet, 3D results |
| Software | Visualizer 3D Studio Professional Edition | Visualizer 3D Studio Professional Edition |
| Operating time | Control unit about 4 hours | Controller at least 16 hours; power box 8 to 100 hours by power level |
| Weight | Control unit about 1.6 kg (3.5 lb); each antenna 1.5 kg (3.3 lb) | Controller 0.6 kg (1.3 lb); power box 15.8 kg (34.8 lb) |
| Warranty | 2 years | 2 years |
Why Buy the OKM GeoSeeker from Serious Detecting?
- Free Shipping on Orders Over $99: Your OKM GeoSeeker ships at no extra cost across the continental US.
- Authorized OKM Dealer: Showroom in Ypsilanti, Michigan, full 2-year manufacturer warranty and product registration support.
- Help Before and After You Buy: Our staff answer setup, electrode and GeoSeeker questions by phone or email.
