Researchers and commercial surveyors working in coastal waters saw what our best-selling Sentinel instrument could do. So they asked us for a version for underway current profiling from inshore hydrographic survey vessels. Mariner is the result. It gives fine along-track resolution thanks to RDI's superior low-noise data, including bottom tracking. And it's easily teamed with the vessel's DGPS input to integrate ADCP™ readings with precise position information.