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water depth, in meters
Depth (12 kHz) ( Depth12); 12 kHz water depth (meters) from sea surface obtained by Knudsen bathymetry system. See Knudsen Bathymetry information for sound speed and transducer depth corrections; normally based on 1500 m/s sound speed & corrected for 5.95 meter (19.5 ft) transducer depth.