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  2. Underwater acoustic positioning system - Wikipedia

    en.wikipedia.org/wiki/Underwater_acoustic...

    Accuracy depends on transducer spacing and mounting method. When a wider spacing is employed as when working from a large working barge or when operating from a dock or other fixed platform, the performance can be similar to LBL systems. When operating from a small boat where transducer spacing is tight, accuracy is reduced.

  3. Kettle Moraine - Wikipedia

    en.wikipedia.org/wiki/Kettle_Moraine

    The major part of the Kettle Moraine area is considered interlobate moraine, though other types of moraine features, and other glacial features are common. [1] The moraine is dotted with kettles caused by buried glacial ice that calved off the terminus of a receding glacier and got entirely or partly buried in glacial sediment and subsequently ...

  4. Multibeam echosounder - Wikipedia

    en.wikipedia.org/wiki/Multibeam_echosounder

    A multibeam echosounder is a device typically used by hydrographic surveyors to determine the depth of water and the nature of the seabed. Most modern systems work by transmitting a broad acoustic fan shaped pulse from a specially designed transducer across the full swathe acrosstrack with a narrow alongtrack then forming multiple receive beams (beamforming) that are much narrower in the ...

  5. Fishfinder - Wikipedia

    en.wikipedia.org/wiki/Fishfinder

    When the fish enters the leading edge of the sonar beam, a display pixel is turned on. As the fish swims toward the centre of the beam, the distance to the fish decreases, turning on pixels at shallower depths. When the fish swims directly under the transducer, it is closer to the boat so the stronger signal shows a thicker line. As the fish ...

  6. Echo sounding - Wikipedia

    en.wikipedia.org/wiki/Echo_sounding

    Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water . It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight , along with knowledge of the speed of sound in water, allows determining the distance ...

  7. Kettle Moraine State Forest - Wikipedia

    en.wikipedia.org/wiki/Kettle_Moraine_State_Forest

    The chief feature of the reserve is the Kettle Moraine, a highly glaciated area. The area contains very hilly terrain and glacial landforms, such as kettles , kames and eskers . The 56,000-acre (23,000 ha) [ 1 ] forest is divided into two large and three small units, which are spread across a hundred miles.

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