The sensitivity menu has up and down arrows, plus a vertical bar
graph. The
graph gives a visual indication of the sensitivity level. A
number beneath
the down arrow also shows the
sensitivity level. There
are 32 steps of sensitivity.
To increase the
sensitivity level, press the
key adjacent to the menu's
up
arrow on the left side of the unit. As you press
the key, the
menu's
bar graph will grow taller and the number will increase in value. You
can also see the difference on the
chart record as it scrolls. When the
sensitivity
is at the desired level, release the key.
To decrease the
sensitivity level, press the key adjacent to the down
arrow. The bar graph and the number will decrease. When the
sensitivity
is at the
desired level, release the
key.
When you reach either the maximum or minimum limit, the
speaker
will
sound an alert tone.
To turn the menus off, press
the
key adjacent
to the CLEAR label at the
bottom left side of the unit.
GRAYLINP
GRAYLINE®lets you distinguish between strong
and weak echoes. It
"paints" gray on targets that are stronger
than a preset
value. This
allows
you to tell the difference between a hard and soft bottom. For
example, a soft,
muddy or
weedy
bottom retums a weaker
signal which
8
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