depth sounder

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depth sounder

[′depth ‚sau̇nd·ər]
(engineering)
An instrument for mechanically measuring the depth of the sea beneath a ship.
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Now with more than 30 patents secured, Airmar produces literally thousands of products--many highly customized--for use in both marine- and land-based applications, including fish finders, depth sounders and weather stations.
Tim Bartlett's A SMALL BOAT GUIDE TO ELECTRONICS AFLOAT (0906754720) covers all kinds of boat navigation systems, from GPS and chart plotters to depth sounders, autopilots, and performance computers.
Separated from other resident orcas, Tsu'xiit began bumping boats, sometimes peeling underwater transponders off hulls as the radar emitted from fish finders and depth sounders bothered him.
Since walleye are typically suspended over deeper waters among open water schools of forage fish, summertime walleye anglers use depth sounders to locate concentrations of suspended forage fish.
Using GPS, depth sounders, masks and snorkels, video cameras and notebooks, we `anchored' the image in three-dimensional reality, as well as mapping the reef's ecological zones and their health.
A spokesman for North Wales Police said items stolen included Global Positioning System navigation units, depth sounders and outboard motors.
In the relatively shallow waters of Northern Europe, navigators could also use sounding lines or depth sounders to determine the depth and type of sea bed (sand, silt, or rock) giving expert navigators information about their position, and this all figured in the corresponding rudder charts.