Lowrance HDS-5 Operation Manual page 119

Troubleshooting
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Bottom echo disappears at high speeds, erratic reading
or weak bottom echo while boat is moving
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transducer.)
When attaching a transducer to the inside of a hull, ONLY
cure properly for shoot-through applications.
Clean the face of the transducer. Oil, dirt and fuel can cause
the water you are in. If this happens, place the unit in the
ducer lower in the water or to another location. The trans-
can interfere with the sonar. This causes the sonar to
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