Eagle Electronics Cuda 128 Portable - Manual (Page 17)

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the transducer is not parallel with the ground when the boat is at rest
in the water or at slow trolling speeds.
Transducer angles and their effects on fish arches.
If the arch slopes up – but not back down – then the front of the
transducer is too high and needs to be lowered. If only the back half of
the arch is printed, then the nose of the transducer is angled too far
down and needs to be raised.
NOTE:
Periodically wash the transducer's face with soap and water to
remove any oil film. Oil and dirt on the face will reduce the
sensitivity or may even prevent operation.
Transducer aimed
too far back
Transducer aimed
too far forward
Proper transducer angle
Partial fish arches
Full fish arch