3D Sonar - Humminbird 748 3D Operation Manual

Using multiple narrow beams together gives you a wide area of coverage for
terrain interpretation and fish location, without sacrificing the detail only a
narrow beam can provide. Your Fishing System gathers information from a
continuous series of these returned signals. It then interprets this information
to create a detailed 3-dimensional view of the terrain passing beneath your
boat as you travel across the water.
NOTE: Depth capability is affected by such factors as boat speed, wave action, bottom
hardness, water conditions, and transducer installation.
How Sonar Works

3D Sonar

Your Fishing System uses a six-
element transducer that transmits at
455 kHz and is capable of reaching
depths of 240 ft (75 m). Each
transmitted beam is symmetrical and
16 degrees in width. The six beams
are lined up next to each other to
provide a total coverage of 53 degrees
from side to side, and 16 degrees from
front to back.
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