Physical Damage and Transom-Mount Transducers
Transom-mount transducers and mounts are vulnerable to physical impacts from submerged rocks and other obstructions or from loading and unloading from a trailer. Impacts can fracture the transducer's inner elements, damage the mount, and degrade or prevent sonar performance. Careful placement of the mounting bracket and regular inspection for damage can protect your investment in your equipment.
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Continual physical impact from turbulence can damage your transducer, so you should not mount it near or aft of areas of the boat that agitate the water (Hull Features and Your Transom-Mount Transducer).
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If you trailer your boat or lift it with a hoist, you should select the mounting location to avoid damage to the device while launching, hauling or storing the vessel.
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Check your transducer mounting hardware periodically for bent or missing screws or other parts. A missing mounting screw can allow water to seep into the hull or transom unnoticed and cause core damage.