Lowrance ActiveTarget Installation Manual page 17

Down orientation
Attach the bracket to the transducer. Secure the assembly to the
motor using the hose clamp. The hose clamp should be tightened
just enough to prevent the transducer from moving during normal
use. Then orient the transducer to the down orientation by firmly
gripping and rotating the transducer until the alignment marks are
aligned.
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Transducer installation | Installation Manual