Vessel Waterline and Your Transom-Mount Transducer
The vessel's waterline is an important placement consideration for a transom-mount transducer.
The vessel's waterline is the level at which the vessel sits in the water.
The hull below the waterline is submerged when the vessel is loaded with a typical combined weight of passengers, fuel, and equipment. The vessel's waterline can vary based on these factors.
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Adding, removing, or redistributing weight on the vessel
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Water depth
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Whether the vessel is moving or stationary
You can use a grease marker or waterproof tape to mark a potential mounting location on the hull, then observe waterline fluctuations when the boat is loaded and moving. Remember these recommendations.
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You should mount your transom-mount transducer parallel to the waterline.
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While the vessel is moving, the device should extend into the water 3.5 mm (0.125 in.) below a fiberglass hull or 10 mm (0.375 in.) below an aluminum hull.