Single Beam Sonar; Dual Beam Sonar - Humminbird PiranhaMAX 165 Installation And Operation Manual

Single Beam Sonar

The PiranhaMAX 165 uses a 200 kHz single beam sonar system with a 28°
area of coverage. Boat speed, wave action, bottom hardness, water conditions
and transducer installation can all affect depth capability.

Dual Beam Sonar

The PiranhaMAX 175, 176i, 195c, and 196ci use a 200/455 kHz dual beam
sonar system with a 28° area of coverage. Dual Beam sonar is optimized to
show the greatest bottom definition using a narrow (16°) beam yet can still
indicate fish found in the wide (28°) beam when the Fish ID+™ feature is
turned on. Dual Beam is ideal for a wide range of conditions - from shallow 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