Eagle Electronics Cuda 128 Portable - Manual (Page 33)

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Clean the chosen area of the hull before attaching the suction cup.
Locate the transducer on the hull as shown in the following figure.
Don't allow the bracket to extend below the hull, because water
pressure against it can cause the suction cup to come off at speed.
Moisten the cup, then press it onto the hull as firmly as possible. Tie
the nylon cord to the boat and route the transducer cable to the sonar
unit. Your portable sonar is now ready for use.
Portable transducer installed on boat transom.
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 earlier segment on Transducer Orientation and Fish
Arches.
Hull
Suction
cup
Bracket
Transducer