Better high speed performance of the depth sounder is one important advantage of through-hull mounting. When mounted properly, there is less likelihood of bubbles or turbulent water flowing across the face of the transducer, causing inaccurate or confusing signals on the depth sounder indicator. Obviously, the throughhull mount is a permanent installation since it involves cutting a hole through the bottom of the boat. It also may require use of fairing blocks to compensate for the deadrise (angle of slope) of the hull bottom. So, the installation must be well planned beforehand.
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