Positioning
Always Know Exactly 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 wired PoE, Mk V Rx-equipped wired, and wireless Wi-Fi configurations.
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.
The three systems, side by side
Two of these answer “where is the ROV?” and one answers “how fast is it moving over the bottom?” - they are not alternatives to each other so much as answers to different questions.
| Omnitrack USBL | ROV Locator (ROVL) | Tracker 650 DVL | |
|---|---|---|---|
| What it measures | Position - complete topside assembly | Position - the acoustic pair only | Speed over the bottom |
| Maximum range | 300 m | 500 m or 300 m | - |
| Height above the bottom | - | - | 0.5 m to 25–50 m |
| Update rate | 1 Hz (up to 5 Hz on the Mk V configuration, at shorter range) | 1 Hz or 1–5 Hz, range dependent | 5–20 Hz |
| Position accuracy at 100 m | about 6.2 m | ≈ 10.4 m CEP | - |
| Price | from €7,000 | from €3,050 | from €2,625 |
| Full details → | Full details → | Full details → |
An em dash means the figure is not published for that model, not that the answer is no. Accuracy is quoted at 100 m slant range so the two positioning systems are compared on the same basis; both tighten as the ROV comes closer to the boat. CEP is the radius containing half the fixes - it is an accuracy figure, not a resolution figure. Full specifications, what is in the box and the common questions are on each product page.
Flagship System
Complete Topside USBL Positioning System
How accurate is USBL positioning on a small ROV? What the numbers mean →
Omnitrack is Cerulean's flagship subsea positioning system: a ring buoy carrying the ROV Locator together with two GNSS receivers, so the topside knows both where it is and which way it is pointing.
Specifications
- Maximum range300 m
- Update rate1 Hz
- Depth, subsea · topside300 · 50 m
- Accuracy (CEP)5–12 m
- Topside linkPoE / Wi-Fi
Full Omnitrack USBL details → - 21 specifications, what is in the box, 11 answers
Accessible Acoustic Positioning for Every Operator
The ROV Locator is the acoustic half of a USBL system without the topside assembly around it.
Specifications
- Max range, by model300–500 m
- Update rate1–5 Hz
- Accuracy at 100 m≈10 m CEP
- Topside depth exposure50 m
- Subsea depth rating300 m
Full ROV Locator (ROVL) details → - 23 specifications, what is in the box, 11 answers
ROV Locator
DVL
Doppler Velocity Log for Stabilization & Tracking
The Tracker 650 is a 675 kHz Doppler velocity log that measures your ROV’s speed over the bottom, so the flight controller can hold station instead of drifting on the tether.
Specifications
- Ping frequency675 kHz
- Update rate5–20 Hz
- Operating height0.5 m to 25–50 m
- Max speed5 kts
- Beams3
- Depth rating300 m
Full Tracker 650 DVL details → - 19 specifications, what is in the box, 7 answers
Target Locked, in Real Time
SonarView fuses USBL bearing and DVL velocity into one continuous, smooth track of your vehicle - rendered live over the seabed.
One unified picture of where everything is
USBL gives you absolute 3D position; the Tracker 650 DVL fills every gap between pings with smooth velocity-derived motion. SonarView fuses both into a single live track over the seabed - so the pilot always sees vehicle, target and heading together, with a clear "Target Locked" status.
- Continuous track - no jumps between USBL fixes
- GNSS compass keeps bearing true near steel and structure
- Geo-referenced output ready for charts and reports
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.
Subsea Positioning, Demonstrated
Footage from Cerulean Sonar - the OmniTrack USBL positioning system in overview, plus a hands-on look at calibrating the ROV Locator for accurate tracking.
The OmniTrack subsea positioning system - USBL tracking that pinpoints your ROV without surface infrastructure. Source: Cerulean Sonar
ROV Locator IMU Calibration
A step-by-step walkthrough of the IMU calibration that keeps the ROV Locator (ROVL) delivering accurate bearing and range for reliable subsea positioning.
Your Cerulean Sonar Partner
We represent Cerulean Sonar worldwide - supplying USBL, ROVL and DVL alongside the ROV platforms they track, with integration support behind every quote.
Worldwide Supply
Authorised to supply the full Cerulean Sonar positioning range internationally - no regional restrictions.
Fused Systems
USBL, DVL and the BlueROV2 specified to work together in SonarView from the first dive.
Right-Sized
We match ROVL, Omnitrack or a USBL+DVL bundle to your accuracy needs and budget - not just the top of the range.
Quote-Based, No Pressure
Clear EUR quotes including topside floats, GPS and brackets. Reach us by email or the form below.
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.