Dual Beam Sonar - Humminbird PiranhaMAX 155 Installation And Operation Manual

Dual Beam Sonar

Your PiranhaMAX uses a 200/83 kHz dual beam sonar system with a wide (60°)
area of coverage. Dual Beam sonar is optimized to show the greatest bottom
definition using a narrow (20°) beam yet can still indicate fish found in the
wide (60°) beam when the Fish ID+ feature is turned on. Dual Beam is ideal
for a wide range of conditions - from shallow water to very deep water in both
fresh and salt water. Boat speed, wave action, bottom hardness, water
conditions and transducer installation can all affect depth capability.
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PiranhaMAX Sonar Technology