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It is important to understand the significance of
the 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.
The returned sonar echoes are displayed
on the screen. As a new echo is received,
the historical data scrolls across the screen.
What’s on the Sonar Display