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The ducer needs to be roughly parallel with the boats bottom and mounted so it will just ride on the water while on plane. The bottom half of the ducer should be in the water while the upper half remains visible while looking over the transom. Download the Raymarine Installation PDF and the operators PDF. Try to study both before you begin to install the Dragonfly. The ducer mounting bracked has vertical slots for the mounting screws. This allows for some adjustment after you've mounted the ducer.

It's all pretty straight forward just follow the instructions carefully. Dry fit everything before installing. Ensure the cable from the ducer to the display is long enough before drilling for the display. I had to fabricate a power cord extension.