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Subsea Positioning
Always Know Where
Your ROV Is
From entry-level ROV Locators to full USBL topside assemblies with GNSS compass integration — Cerulean Sonar offers a complete range of subsea positioning solutions for explorers, researchers, and commercial operators.
Three Systems. Every Budget.
Whether you need basic position awareness or high-precision tracking with velocity integration, Cerulean Sonar has a cost-effective solution for your application.
Omnitrack USBL
Complete topside positioning assembly with integral GNSS compass. Magnetic-interference immune. Available in acoustic-sync (Mk III) and Ethernet-sync (Mk V) variants.
ROV Locator (ROVL)
Budget-friendly acoustic positioning in Mk II and Mk III versions. Proven accuracy for recreational and light commercial ROV operators needing reliable underwater tracking.
Tracker 650 DVL
675 kHz Doppler Velocity Log for position hold, motion tracking, and seamless USBL gap-filling. MAVLink/ArduSub compatible. 5–20 Hz update rate.
Flagship System
Complete Topside USBL Positioning System
The Omnitrack USBL is Cerulean Sonar's flagship subsea positioning solution, providing 3-dimensional tracking of your ROV or subsea asset from a topside deployment assembly. It uses an Ultra-Short Baseline receive array paired with a pinging transponder on the ROV to detect range and direction with high precision.
The integral GNSS compass eliminates magnetic interference issues — a common limitation of systems relying on magnetic compasses — making Omnitrack equally effective near steel vessels, ports, and metallic structures.
Choose Your Variant
Traditional acoustic communication. No clock sync required. Works with any vehicle — electrical power only to transponder.
Network-based clock synchronization for enhanced timing accuracy. Leverages existing Ethernet infrastructure on the ROV tether.
- Integral GNSS compass — immune to magnetic interference
- Full topside deployment assembly included
- Simple deployment from boat, pier, or shore
- Latest Ethernet Mk III USBL components
- Available in tethered or Wi-Fi topside variants
- Integrates with SonarView for full position visualization
Accessible Acoustic Positioning for Every Operator
The ROV Locator (ROVL) family delivers reliable underwater position tracking at an entry-level price point — making it ideal for recreational divers, research teams, and commercial operators who need to know where their ROV is without the cost of a full USBL system.
Two variants are available with different synchronization approaches. The Mk III offers improved ease-of-use; the Mk II trades slightly more complexity for a lower price point. Neither requires a GNSS compass, keeping the system lightweight and deployable in minutes.
- Cost-effective alternative to full USBL systems
- Mk II: proven reliability at the lowest price point
- Mk III: enhanced ease-of-use and improved accuracy
- No magnetic compass calibration required
- Compatible with SonarView positioning visualization
- Pair with Tracker 650 DVL for continuous tracking
ROV Locator
DVL
Doppler Velocity Log for Stabilization & Tracking
The Tracker 650 is a 675 kHz Doppler Velocity Log (DVL) that provides high-update-rate velocity information for ROV stabilization, position hold, and integrated position tracking. Operating at 5–20 Hz, it fills the gap between USBL position updates — delivering smooth, continuous tracking when fused with SonarView.
Three Key Capabilities
- 675 kHz operating frequency; 5–20 Hz update rate
- 3 velocity sensors at 70° from horizontal
- 25–50 m max operating height above seafloor
- MAVLink / ArduSub / BlueOS compatible
- Ethernet 10/100 Mbps; 10–30 V DC; 2.75 W typical
- 300 m depth rated; 108 mm diameter; 550 g air / 135 g water
Technical Specifications ▼
| Ping Frequency | 675 kHz |
| Ping Repetition Rate | 5–20 Hz |
| Velocity Sensors | 3 beams |
| Sensor Angle | 70° down from horizontal |
| Angular Envelope | 0–20° off vertical |
| Max Operating Height | 25–50 m (seafloor dependent) |
| Min Operating Height | 50 cm |
| Max Speed | 5 knots |
| Supply Voltage | 10–30 V DC |
| Typical Power | 2.75 W |
| Peak Current | 0.5 A |
| Ethernet | 10/100 Mbps |
| Depth Rating | 300 m |
| Diameter | 108 mm |
| Weight (Air / Water) | 550 g / 135 g |
Better Together
Cerulean positioning products are designed to work in combination. SonarView fuses all data streams into a single, unified operational picture.
USBL + DVL Fusion
The Tracker 650 DVL fills the gap between USBL position updates — providing smooth, continuous tracking when fused with Omnitrack or ROVL data in SonarView.
Sonar Mosaic Mode
Combine the Tracker 650 with an Omniscan FS in SonarView to build real-time geo-referenced sonar mosaics comparable to multibeam systems costing 10× more.
SonarView Integration
All positioning products feed directly into SonarView — available for Windows, macOS, Linux, and browser-based via BlueOS. One interface for your entire sensor suite.
Designed for Blue Robotics Platforms
Cerulean Sonar products integrate seamlessly with the leading ROV and uncrewed surface vehicle platforms — both of which we carry.
BlueBoat USV
The BlueBoat is the ideal surface platform for the Surveyor 240-16 MBES and Omniscan 450 SS-BB. Build a complete autonomous survey system with sensors and vessel from one supplier.
View BlueBoat →
BlueROV2
The most popular ROV in the world is built for Cerulean Sonar. Mount the Omniscan 450 FS, ROV Locator, or Tracker 650 DVL using purpose-designed brackets. Native ArduSub and BlueOS compatible.
View BlueROV2 →Find the Right Positioning System
Not sure which system suits your application? Tell us about your ROV, operating depth, and tracking requirements — we will recommend the right solution.
Request Positioning Quote
Our team will respond within one business day with a tailored recommendation and EUR pricing.