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SENSITIVITY
The sensitivity menu lets you control the unit’s ability to pick up echoes. A
low sensitivity level excludes much of the bottom information, fish signals,
and other detail. High sensitivity settings lets you see features, but it can
also clutter the screen with noise and other unwanted signals. Typically,
the best sensitivity level shows a good, solid bottom signal with grayline.
This unit adjusts the sensitivity level to keep a solid bottom signal on the
screen. It adds a little extra when it’s in the automatic mode. This gives it
the capability to show fish and other detail. However, situations occur
where it becomes necessary to increase or decrease the sensitivity level.
Typically, this occurs when you wish to see more detail, so you need to
increase the sensitivity. The procedure to adjust it is the same whether the
unit is in the automatic or manual mode.
To change the sensitivity level, first press a
menu key until the sensitivity menu appears.
If the unit is in automatic, the menu shows
“AUTO SENS.” Otherwise, the menu shows
“MAN SENS.” Now press the up arrow key to
increase the sensitivity, the down arrow to
decrease it. Echoes scrolling onto the screen
will also show the effects of the sensitivity
change. If you reach the maximum or mini-
mum sensitivity level, a tone sounds alerting
you to the limits.
After you’ve adjusted the unit to the desired
sensitivity level, press the PWR/CLEAR key to clear the display. If you wait
a few seconds, it will automatically clear.
FISH ID FEATURE
The Fish ID feature identifies targets that meet certain conditions as fish.
The microcomputer analyses all echoes and eliminates surface clutter,
thermoclines, and other undesirable signals. In most instances, remaining
targets are fish. The Fish ID 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, etc.
The microcomputer is sophisticated, but it can be fooled. It can't distinguish
between fish and other suspended objects such as turtles, submerged