Lowrance X-4 Installation And Operation Instructions Manual page 27

Bolt
Washer
Portable transducer assembly: rear view (left) and side view (right).
NOTE:
For optimum operation, the portable transducer should be adjusted
so that it is parallel to the ground. For more information on this,
see the segment in the unit's operation manual on Transducer
Orientation and Fish Arches.
Moisten the suction cup and then press it onto the hull as firmly as
possible. Tie the nylon cord to the boat and set the power pack and sonar
unit in a location for easy viewing. Your portable sonar is now ready for use.
Tie
nylon
cord
here
Suction
cup
Nut
Washer
Transducer
21
Screw