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USING THE 200DXUSING 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.