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2 companies

Nortek AS WEB site

Location not listedUpdated Dec 2002

Nortek AS develops advanced underwater instruments such as Acoustic Doppler Current Profilers (ADCPs) and Doppler Velocity Logs (DVLs) used for oceanographic research, subsea navigation, and marine operations.

RD Instruments

San Diego, CA, United StatesUpdated May 2026

Teledyne RD Instruments, based in San Diego, designs and manufactures underwater acoustic Doppler products for current profiling, wave measurement, and precision navigation. Now part of the Teledyne Marine group.