Founded in 1986 and headquartered in Houten, the Netherlands, Stema Systems is a leading provider of advanced hydrographic and geophysical survey solutions. With decades of experience in the maritime sector, Stema delivers integrated systems and services for sub-bottom profiling, sediment characterisation, and fluid mud monitoring.

The company designs and manufactures both hardware and software in-house. Its flagship software, SILAS, enables sophisticated 2D and 3D data acquisition, processing, and interpretation of sub-bottom acoustic data. Key hardware offerings include the EBP sub-bottom profiler and RheoTune, a specialised probe for measuring yield stress, viscosity, and density of fluid mud—critical for accurate nautical depth determination in ports and waterways.

Stema also maintains a comprehensive rental fleet to support a wide range of survey operations. Available systems include side scan sonars (SSS), USBL positioning systems, gyro and INS units, multibeam echosounders, SV sensors and profilers, magnetometers, sonars, underwater cameras, altimeters, and more. All equipment is supplied fully calibrated, with optional integration support, training, and technical assistance.

In addition to equipment and software, Stema offers full survey support services—from mobilisation and system integration to data processing and interpretation. The company is ISO 9001 certified and trusted globally by port authorities, research institutes, dredging contractors, and engineering firms for its reliability, innovation, and client-focused approach.