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Finally an underwater positioning system that doesn't cost more than the vehicle! The ROV Locator comprises a pinger mounted on the ROV and a USBL receiver module on the surface. Simply sync them up at the start of the dive and track the ROV location in real time on the QGroundControl map display. Serial communication and API available.

Product Choices

HS Code: 9015.80


This USBL system is designed for low-cost, medium accuracy localization of underwater objects. It can be used to guide an ROV to an area of interest, either manually or autonomously. The system can also locate an ROV among other possible applications.

A complete system requires both a transmitter and a receiver. After calibration, transmitters are paired with specific receivers and should not be interchanged. The system works by syncing the clocks of a transmitter and receiver. The transmitter then sends a sound pulse once per second. The receiver uses time-of-flight to calculate slant range to the transmitter and phase measurements to determine the arrival angle of the sound pulse.

Technical Details

Technical Details Values

Maximum Depth*

100m / 300m

Volume, Receiver Unit

295 ml

Mass, Receiver Unit

278 gm

Volume, Transmitter Unit

295 ml

Mass, Transmitter Unit

327 gm

Absolute Maximum Range

1 km

Typical Usable Range


Apparent Yaw/Azimuth resolution**

Apparent Elevation angle resolution**

Slant range measurement resolution **


Slant range error accumulation (typical)

2 m/hr

IMU Euler angle accuracy, typical***

Update rate


Ping Frequency

25 kHz

Receiver V-in power

4.5V to 28V DC <1 Watt

*Select correct product – **Resolution does not equal accuracy

*** Magnetic errors not included

Communicating with the ROVL

Testing has been completed using QGroundControl to communicate with our ROVL product. The Cerulean team has created a sample utility that enables the ROV's location to be displayed in the map view of QGroundControl. The user can then create a waypoint in QGroundControl and drive to it.

The Cerulean Companion is an open-source program, which allows customers with Python knowledge to customize/add functionality to match their requirements.

The following link ( provides the steps to getting the ROVL to work with QGroundControl. These instructions currently support the ROVL Rx on the topside connected to a laptop and the ROVL Tx on the ROV.


What comes in the box

  • One Locator USBL Receiver – 100m
  • One Locator Beacon – 100m
  • One ROV Mounting Bracket
  • Notes:
  • - When selected, Receiver and Beacon are replaced with 300m rated units.
  • - The 6.5-meter serial-to-USB conversion cable will be included when selected as an accessory.

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Cerulean Companion App

Companion app enables Cerulean Sonar devices to share their data with other hosts and services, such as QGroundControl or a BlueROV2. Click here to download the App