The key components of the NAMMU OBS are:


Up to 50 units can be transported in one 20-foot shipping container. Easy and intuitive programming is offered over a web interface via Wi-Fi – accessible from your laptop or smartphone. No special software is required. Usually a free-falling system, it can also be deployed by ROV.


Deployments of up to three years are possible due to low power consumption with reliable storage of vital instrument data and metadata. Good coupling is facilitated through a compact instrument design and an aquadynamic shape enables industry-leading low levels of external noise.


Extremely reliable acoustic release is key for retrieval. Other features include quick location of the instrument with radio beacon and flasher, as well as fast data download via external memory StiK. Easy, fast data conversion to mSEED is possible via our portable open-source software.

Features & Benefits


Made from corrosion-resistant titanium and durable syntactic foam, the frame offers buoyancy in a shock-resistant and robust package that can easily endure the forces of the sea. The unit’s small size makes it possible to deploy more systems than ever before.


There is a seismometer for every use case ranging from broadband seismometers to high-frequency geophones. A hydrophone complements the seismic data for extended precision.

Datalogger 6D6

The Datalogger 6D6 is a flexible data acquisition system with the lowest power consumption on the market and outstanding data quality. It features an easy programming interface accessible via Wi-Fi and large storage capacities to enable extended deployment of up to three years.

Acoustic Releaser

The releaser brings the instrument back to the surface in perfect condition. It is the world’s smallest, most lightweight titanium release unit – fully reliable in even the most challenging circumstances.


Technical Data

Weight with 80 Li cellsIn air (In salt water)
Weight without anchor156kg (-13kg)
Weight with anchor205kg (30kg)
Weight of pressure tube45kg (33.6kg)
Weight of releaser KUMQuat11kg (6.4kg)
Maximum operation depth6000m
Maximum operation time13.7 months (80 Li cells) 36 months with optional battery pack unit
Size without flag w×h×d635mm × 770mm × 800mm
Anchor size800mm × 600mm
Seismic sensors120s broadband seismometer or 4.5Hz geophones
Pressure sensor100s hydrophone HTI-04-PCA ULF or differential pressure gauge (DPG) or absolute pressure gauge (APG)
Data loggerK.U.M. 6D6: 4 channels at 32 bit at 142dB
ReleaserKUMQuat 562