The colour on your display is crucial here for identifying a brush and logs. Because they will send a different frequency of sonar return, your fish finder will show them in a different color to the bottom (otherwise, it will just look like a hump). So make sure you choose a color palette that will highlight this difference. In the Deeper App, choose either the Classic color mode (where brush and logs will show green, like vegetation) or the Day color mode (where they will show purple).
The side scan will scan much more around the boat but are not as effective, especially in deep water. For this reason alone, you may feel the need to buy two seperate fish finders but some premium models have both side and down scanning capabilities. This means you can usually view both at the same time for a very detailed scan around the boat in all directions.
The power of a fishfinder—the strength of the “ping”—is expressed in watts RMS (root mean squared). Power is directly related to how well you see in silt-laden water, view down to greater depths, and successfully resolve separate targets and bottom structure. A 500-watt (RMS) fishfinder should have plenty of power for most coastal applications. Serious bluewater anglers should look for 1,000 watts or more. Inland lake fishermen can see the shallow bottom with only 200 watts.
Thru-hull: This means a threaded bronze, nylon or stainless steel shaft passes through the bottom surface of the hull. You have several styles to choose from: external football-shaped head with water flow smoothed by a fairing block that also corrects for the dead rise (sideways slope of the hull); or round mushroom head thru-hulls, either semi-flush or flush mounted. These are the most challenging to install, but likely to provide the best signal quality. Displacement power and sailboats generally use thru-hulls.
The image to the right shows a school of white bass aggressively feeding on a school of threadfin shad. Note the school of baitfish near the bottom. When threatened, baitfish form a tightly packed school, as the individuals seek safety in the center of the school. This typically looks like an irregularly shaped ball or thumbprint on the fishfinder screen. When no predators are nearby, a school of baitfish frequently appears as a thin horizontal line across the screen, at the depth where the temperature and oxygen levels are optimal. The nearly-vertical lines near the right edge of the screen show the path of fishing lures falling to the bottom.
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