We make advanced instruments to measure movement underwater. Nortek’s advanced Acoustic Doppler Current Profilers (ADCPs) and Doppler Velocity Logs (DVLs) use the Doppler effect to measure motion in the marine environment. ADCPs are used to measure oceanographic processes as seen in currents and waves, while DVLs help subsea vehicles to navigate underwater. We also offer Vessel Mounted solutions available in a diverse number of functionalities and profiling ranges. These are renowned for their outstanding bottom-tracking performance and ability to measure currents precisely.