ROV Locator Bundle Mark III

Regular price $6,055.00


The Mark III ROV Locator takes the ease of use of a cost-effective underwater positioning solution to a new level. Using the interrogate/response model of a traditional USBL system, it dispenses with both distance sync at the start of the mission and period crystal calibration procedures. With the supplied topside CeruleanTracker software, you can get up and running in no time or use the open API to integrate the Mk III with your own software. The MK III has a 300m depth rating, and with no timebase drift, the system can remain submerged indefinitely without losing slant range accuracy.

The Mark III, ROV Locator bundle includes a transponder (usually mounted on the ROV or AUV) and a transceiver module (usually located on the surface). It also comes with a mounting ring and adapter for your ROV or AUV. ROV/AUV integration can be as simple as just supplying power from the vehicle battery. You can also add a dedicated battery for the Mark III to track the vehicle in case of primary battery failure. Simply apply power, start the dive and track the ROV location in real-time on a QGroundControl map display or use the free CeruleanMap display software if you don't want to use QGC. Serial communication to either transceiver or transponder is available, and the open API is documented in the user manual.

In operation, the Mark III transceiver sends an interrogation sonar pulse to the transponder, which returns a sonar reply. The slant range is calculated from the round-trip time of flight. Unlike the Mark II systems, start-of-mission timebase synchronization is never needed. The Mark III system can remain submerged indefinitely without fear of slant range accuracy drift. Only one Mark III pair can operate in an area at one time.

Maximum Depth Exposure (minimum crush depth)


Volume, Transceiver Unit


Mass, Transceiver Unit


Volume, Transponder Unit


Mass, Transponder Unit


Absolute Maximum Range


Typical Usable Range


Apparent Yaw/Azimuth resolution


Apparent Elevation angle resolution


Slant range measurement resolution


IMU Euler angle accuracy, typical (magnetic errors not included)

Update rate


Transceiver Ping Frequency


Transponder Ping Frequency


Transceiver V-in power (See note)

Vin: 5-16V DC
2.5W average, 3.5W peak @5V DC
2.1W average, 3.3W peak @12V DC

Transponder V-in power (See note)

Vin: 5-28V DC
1.7W average 2.9W peak @5V DC
1.3W average, 4.1W peak @16V DC

Serial Comms Voltage Levels

3.3V TTL or 5V TTL, auto sense

NOTE : Power supplies for both units must be able to supply burst currents to prevent drop-out and erratic operation. While the transmitter will work with a low impedance 5V supply we recommend using 9V or higher, unless you know how to figure out if your 5V power supply is low-enough impedance.

NOTE : Resolution does not equal accuracy.


  • 1 x ROVL Receiver
  • 1 x ROVL Transmitter (Beacon)
  • 1 x Mounting ring and Bracket

Notes: The Cerulean "6.5 meter serial-to-USB conversion cable" must be preinstalled when purchasing the ROVL Mk II product. It is not upgradeable afterward.