Adjusting The Transducer - Lowrance HDS-7 HDS Gen3 Installation Manual

Secure the cable to the hull at regular intervals using cable P clips or
saddles and ensure that moving parts such as an outboard motor or
boarding ladder can't snag the cable.

Adjusting the transducer

If the sonar image shows interference lines on the screen when
moving, which worsen with speed, it may be possible to eliminate
these by adjusting the transducer's angle.
 Note:
A transducer that is tilted too far in either direction will not
perform well; missing targets, and/or losing the bottom at speed.
If performance does not improve with tilting, try adjusting the
height of the transducer relative to the transom of the boat. If the
transducer is too high it may be seeing cavitation caused by the
trailing edge of the transom.
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Mounting the transducer | HDS Gen3 Installation Manual