A DVL is a sonar system that measures motion under water. DVLs emit sound bursts along beams angled downward in various directions. Echoes that are scattered off the seabed are returned. Because the DVL sonar is aboard a moving vehicle,returning echoes carry a change in pitch; this is the Doppler Effect. Combining these readings tells how fast the vehicle is movingand in what direction.
The Nortek's DVL is available as two models, the 1 MHz and 500 kHz. These two DVLs differ primarily in the operational depth and the expected bottom track range.
Syrinx is a 600 kHz Doppler Velocity Log (DVL) for surface and subsea vehicles. It combines the high altitude, high resolution features of 300 kHz and 1200 kHz DVLs
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