Humminbird 200DX manual What YOU see on Screen

USING THE 200DX

WHAT YOU SEE ON SCREEN

Structure. Structure is defined as any object physically attached to the bottom. The sonar configuration of the 200DX is optimized to give the most accurate depiction of bottom structure possible. Grass, trees, stumps, wrecks or other debris are accurately displayed, however the depiction or these objects varies with boat speed and direction. The best way to learn to interpret structure is to operate the 200DX over a variety of known conditions and experiment with user functions to best represent those conditions on-screen.

Surface Clutter. Surface clutter is the layer or water near the surface that is rich in algae and other growth and often it aerated by wind or wave action. This area of water interferes with sonar transmission and often appears on-screen as regular clusters of individual dots near the 0 line.

Thermoclines. Thermoclines are sharp differences in water temperature. These are easily identified by the continuous nature of the return.

Second Returns. When a sonar signal is reflected off the bottom back to the transducer there is often enough energy left in the signal to be reflected off the surface of the water back to the bottom a second time. Second returns appear as a slightly weaker bottom representation exactly twice the depth of the primary bottom return. The second return is most likely to occur in shallow water and in areas of relatively hard bottom.