USING THE 150SX
WHAT YOU SEE ON-SCREEN
Bottom. The graphic depiction of the bottom provides an effective tool for understanding the composition of the bottom. If the bottom is hard and smooth, the bottom depiction is narrow and dense. If the bottom is soft mud or sand, the depiction will be thick and less dense. This indicates much of the signal is absorbed by the soft bottom. If the bottom is rocky or rugged in composition, the depiction is of varying density and textured in appearance.
Wave action also affects the bottom depiction. The information drawn is a distance measurement, so if the boat is moving up and down over flat bottom, the bottom depiction often appears in regular variations that match wave timing.
Structure. Structure is defined as any object physically attached to the bottom. The sonar configuration of the 150SX 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 of these objects varies with
boat speed and direction. The best way to learn to interpret structure is to operate the 150SX over a variety of known conditions and experiment with user functions to best represent those conditions
Surface Clutter. Surface clutter is the layer of water near the surface that is rich in algae and other growth, and often is aerated by wind or wave action. This area of water interferes with sonar transmission and often appears
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
9
