Eagle Electronics Cuda 128 Portable - Manual (Page 45)

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At left, little Grayline indicates a soft bottom, probably sand or mud.
At right, the wider Grayline indicates a harder, rocky bottom.
Press UP ARROW to increase the level or press DOWN ARROW to
decrease it. The percentage of Grayline in use shows in this menu.
Echoes scrolling onto the screen will also show the effects of the
Grayline change. If you reach the maximum or minimum level, a tone
sounds alerting you to the limits. Press
PWR to clear the menu.
FISH I.D.

The Fish I.D.
 feature identifies targets that meet certain conditions
as fish. The microcomputer analyses all echoes and eliminates surface
clutter, thermoclines and other signals that are undesirable. In most
instances, remaining targets are fish.
The Fish I.D. feature displays symbols on the screen in place of the
actual fish echoes. There are three symbol sizes: small, medium and
large. These show the relative size between targets. In other words, it
displays a small fish symbol when it thinks a target is a small fish, a
medium fish symbol on a larger target and so forth.
Wider
Grayline
 Thin or no Grayline
