Cetacean Research RUDAR™
Remote Underwater Digital Acoustic Recorders

Cetacean Research RUDAR™ are held-held, ultra compact, autonomous underwater recording devices. Some are short term, some long; features vary. RUDAR™ are designed for a wide range of applications and budgets.


The  Cetacean Research nano Remote Underwater Digital Acoustic Recorder (nRUDAR-mk2™) is a hand-held, ultra compact, short-term, autonomous underwater recording device that is designed for a wide range of applications.

photo of a nRUDAR-mk2
symbol for engineering, industry, noise-monitoring hydrophone systems
symbol for recreation, art, education, and tourism hydrophone systems
symbol for research and professional systems
symbol for autonomous recording device or acoustic tag
symbol for portable hydrophone systems


Uses of the nRUDAR-mk2™ vary from manual underwater recording while diving to autonomously recording wild cetacean vocalizations for several days continuously. This makes it an excellent tool for recording high resolution audio for underwater video production, as well as scientific research

See the other photos in this series to see just how small and portable these powerful autonomous underwater recording devices are!

more about nRUDAR-mk2™

The Cetacean Research µRUDAR-mk2™(micro Remote Underwater Digital Acoustic Recorder) is a very compact, short-term, autonomous recording device that is designed for fast and easy deployment in a wide range of applications.

µRUDAR-mk2™
symbol for engineering, industry, noise-monitoring hydrophone systems
symbol for recreation, art, education, and tourism hydrophone systems
symbol for research and professional systems
symbol for autonomous recording device or acoustic tag
symbol for portable hydrophone systems


Uses of the µRUDAR-mk2™ range from remote detection of methane bubbles to recording wild cetacean vocalizations for periods of more than two days.

The µRUDAR-mk2™ uses the same hydrophone element and preamplifier as our Sensor Technology SQ26-08 hydrophone along with a 24-bit, 96kHz digital recorder.

See the other photos in this series to see just how small and portable these powerful autonomous underwater recording devices are!

more about µRUDAR-mk2™

The Cetacean Research RUDAR™ (Remote Underwater Digital Acoustic Recorder) is a compact, long-term autonomous recording device that is light enough to be deployed by hand from small boats.

RUDAR deployed

photo of conceptualRUDAR™prototype deployed

drawing of RUDAR

RUDAR™ 3D drawing

symbol for engineering, industry, noise-monitoring hydrophone systems
symbol for research and professional systems
symbol for autonomous recording device or acoustic tag
symbol for portable hydrophone systems


The RUDAR™ system utilizes the data acquisition and processing components of the  ST1400ENV mobile data recorder & sound level monitor. Interchangeable Cetacean Research  C57- or C305- series hydrophones are used for signal detection. This system has very low power consumption that allows extended remote recording sessions and continuous high-speed data acquisition.

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Development Background - the idea for a portable remote underwater recording device came about after several conversations in 2000 and 2001 with fisheries biologist Rodney Rountree of the University of Massachusetts at Amherst. The first conceptual RUDAR™ prototype was completed in early January 2002 for NOAA and the University of Hawaii's Coral Reef Ecosystem Investigation.