![]() The word sounding is used for all types of depth measurements, including those that don't use sound, and is unrelated in origin to the word sound in the sense of noise or tones. Conversely, fixed-location techniques use stationary transducers to monitor passing fish. Hydroacoustic assessments have traditionally employed mobile surveys from boats to evaluate fish biomass and spatial distributions. Echo sounding can also refer to hydroacoustic "echo sounders" defined as active sound in water (sonar) used to study fish. ![]() This information is then typically used for navigation purposes or in order to obtain depths for charting purposes. The time interval between emission and return of a pulse is recorded, which is used to determine the depth of water along with the speed of sound in water at the time. The MTVZA sounder received from the Meteor M2-2 satellite by an amateur stationĮcho sounding is a type of sonar used to determine the depth of water by transmitting acoustic waves into water.
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