Surface reference
System position and heading associated with acoustic measurements.
POSITIONING / USBL
ROVL Mark III
An acoustic link to locate the ROV.
Cerulean USBL system linking a surface reference to the relative position of a submerged transponder.
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THE SYSTEM IN PRACTICE
How it fits
your work.
ROVL Mark III uses acoustic measurements to locate the ROV unit. Converting them into geographic coordinates also requires the position and heading of the surface reference.
Cerulean Mark III kits sold after September 2025 include the Mark V underwater unit, which can recognise the operating mode. This does not make Mark III and the complete Mark V system identical: receiver and synchronisation must be distinguished.
Vehicle transponder
Underwater unit for ROV positioning.
Integrated display
Position can be displayed at the control station.
CONFIGURATIONS, EQUIPMENT AND DATA
A closer look.
The SORS bundle in use
Our configuration includes a USB GPS antenna on the piloting computer, a transceiver connected to the station by cable/USB, and an acoustic unit on the ROV. The transceiver is submerged below the vessel’s hull, kept stable and given a clear acoustic path to the vehicle.
The operating page suggests immersing the surface reference by approximately one metre. QGroundControl can display position and track on the map; interfaces, orientation and geographic references require configuration.
Range, depth and version
Link distance references are 300 m or approximately 500 m, depending on configuration; the ROV unit has a 300 m operating depth. Acoustic distance and immersion depth are separate parameters: the applicable limit is defined for the supplied system.
The reference configuration uses one pulse per second. Synchronisation depends on the kit version: not all Mark III units synchronise both units by satellite. Composition and synchronisation must match the chosen version.
PHOTOS AND DOCUMENTATION
Images and details
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The Cerulean range →
Technical documentation: official Cerulean source ↗. Page reviewed on 11 September 2026. Configuration and compatibility require confirmation; stock availability is not implied.
INTEGRATIONS AND SYSTEMS
Build on your system.
CERULEAN / ACOUSTIC POSITIONING
ROV Locator Mark II
Acoustic locator with GNSS synchronisation: an option to compare with Mark III and Mark V for the mission.
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CERULEAN / ACOUSTIC POSITIONING
ROV Locator Mark V
Acoustic positioning system with Ethernet synchronisation, integrated into the surface-to-ROV network.
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SONAR / POSITIONING
Omnitrack
Cerulean surface system combining GNSS reference, heading and acoustic positioning of the submerged vehicle.
Learn moreSURFACE SUPPORT
Float kit for ROVL Mk III
The kit combines a float, telescopic pole and end mount for the ROVL Mk III unit. The two photographs show the retracted support and the assembly with the acoustic unit fitted.
A solution for organising the surface receiving point. Supply contents and compatibility with your system are defined together.
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FROM SPECIFICATION TO OPERATION
Let’s discuss your project.
Environment, equipment and operational objectives.
Together, we define the right configuration.