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CHART SPEED
The rate
echoes scroll across
the screen is called the chart
speed.
It's
adjustable by
first
pressing
the
menu
key,
then
pressing
the
key adjacent
to
the
"Adjust
Chart
Speed"
label.
The chart
speed
menu
appears
on the
right
side of the screen.
Increase the chart
speed by
pressing
the
right
arrow
key
or
decrease it
by pressing
the
left arrow
key.
The
percentage
of chart
speed
in use
changes
as the arrow
.
C
a
1
tion of the chart
speed.
You
r.
can see the
change
on the
-
.
2.
screen
(both
on
the menu and
on the chart
record)
as
you
press
the
keys.
After
you've
/
madethe
adjustment,
pressthe
4
CLR
key
to erase the
menu.
To
stop
the
chart,
pressthe key
adjacent
to the "STOP" label in
the unit's lower left corner.
To
start the
chart, press
the
key
next to the
"START" label.
GRAYLI
NE0
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 tellthe
difference between a hard and
soft bottom. For
example,
a
soft,
muddy
or
weedy
bottom returns a weaker
signal
which is shown with
a narrow or
no
gray
line. A hard bottom returns
a
strong signal
which
causes a.wide
gray
line.
If
you
have two
signals
of
equal
size,
one with
gray
and
the other
without,
then
the
target
with
gray
is the
stronger signal.
This
helps distinguish
weeds
from trees on the
bottom,
or fish from structure.
GRAYLINE is
adjustable.
Since GRAYLINE
showsthe difference between
strong
and weak
signals, adjusting
the
sensitivity may require
a different
ALARMS
The X-70A
has three different
types
of sonar
alarms. The first is the Fish
Alarm. It
sounds when the Fish I.D. feature
determines an echo or
group
of echoes is afish.
Anotheralarm isthe Zone Alarm
which consists of a bar.
Any
echo that
appears
inside this bar
triggers
the alarm. The last alarm is
called the
Depth
Alarm.
Only
the bottom
signal
will
trigger
this alarm. This
is useful as an anchor
watch,
a shallow water
alert,
or
for
navigation.
To
adjust
an
alarm,
first
press
the MENU
key.
Now
the
"Adjust
Alarms" label. The
screen
shown below
appears.
Press the
key
next to the "SET
DEPTH
ALARMS"toadjustthe
shallow
or
deep digital
alarms.Press
the
key
next to
the "SET ZONE
ALARM" to
adjust
the zone
alarm. The fish
alarm doesn't have
an
adjust-
ment. It's either on or off.
Thefollowing
section describes
each sonar alarm
and its limits.
FISH ALARM
Use the
fish alarm for a distinctive audible
alarm when fish or other
suspended
objects
are detected
by
the Fish
!.D. feature. A different tone
sounds for each
fish
symbol
size shown
on the
display.
To turn the fish alarm
on, press
the MENU
key,
then
press
the
key
next to
the
"Adjust
Alarms" label. The screen shown
above
appears.
Now
press
the
key
next to
the "Turn Fish Alarm On' label.
To turn the
fish alarm
off,
repeat
the above
steps.
The label on the Alarms
menu now reads
"Turn Fish Alarm Off". Press the
key
next to that label to
turn the fish alarm off.
25
22
MENU
-
PAGE 1
press
the
key
next to
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