Understanding Sonar History - Humminbird 343c Operation Manual

Understanding Sonar History

It is important to understand the significance of
the 300 Series™ Fishing System display. The
display does NOT show a literal 3-dimensional
representation of what is under the water. Each
vertical band of data received by the control head
and plotted on the display represents something
that was detected by a sonar return at a particular
time. As both the boat and the targets (fish) may
be moving, the returns are only showing a
particular segment of time when objects were
detected, not exactly where those objects are in
relation to other objects shown on the display.
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