Specifications

RANGE
section. For
example,
If
you
have a 30 foot
window,
pressing
the
up
arrow
in the RANGE section will
change
the window to
20 feet. Press
the
up
arrow
again
and the
zoom windowwill
change
to
10 feet. This Is the
smallest
zoom window.
The
largest
zoom window is
300 feet.
AUTOMATIC BOTTOM
TRACKING
The lower limit will
change
as the bottom
depth
changes,
if the Z-
7200 Is in
the automatic
mode. To zoom in on the
bottom and track it as
its
depth changes,
follow the
steps
below.
To use
this
feature,
first
make certain the Z-7200
is
in
theautomatic
mode. If it
isn't,
press
the AUTO
key.
Next,
choose a zoom
window. For
example,
lets use a 20 foot zoom
window. This means
that the Z-7200 will
keep
the
upper
limit 20 feet above
the lower limit.
Automatically placing
the
bottom
signal
in this
window,
the
Z-7200 tracks it as it
moves shallower or
deeper.
Press the ZOOM
key.
The zoom window size
appears
on the
upper
center
portion
of the
display
for a few seconds. If
you
don't have a
20 foot
window,
press
either
the
up
or down arrows in
the RANGE section
until the
upper
limit is 20
feet shallowerthan the lower
limit. The 2-7200 will
choose
an
upper
and lower limit
that will
place
the bottom
signal
in the 20
foot
window. The bottom will
always
be insidethis
window. Ifthe
segment
size is
40 feet or
greater,
the window limits will end in
zero
(10,20,30, etc.).
Otherwise the limits are in one
foot increments.
To exit from this
function,
press
the ZOOM
key.
GRAYLINE
The GRAYLINE
functions tells the relative
strength
of
signals
displayed
on the screen. It
also
gives
clues to the
composition
of the
bottom. In other
words,
you
can tell If the bottom is
soft or hard. A hard
bottom
returns a
strong signal
causing
a wide
gray
line. A
soft,
muddy
or
weedy
bottom returns a
weaker
signal
which is
emphasized
with a
narrow
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 is
helps
distinguish
weeds from
trees on the
bottom,
or
fish from structure.
When the Z-7200
is first turned
on,
the GRAYLINE function
is
automatically
on.
Normally,
it doesn't
require adjustment. However,
should
you
desire
to
change
the GRAYLINE
level,
see menu #8 in
the
COMMAND section,
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11
FC H:
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FFE..S
MENU #12
-
FEET,
FATHOMS,
or
METERS
The
2-7200 can
display
the
depth
in
either
feet, fathoms,
or
meters. At
first,
the
display
reads in
feet. To
change
to fathoms or me-
ters,
press
both
arrow
keys
in the
RANGE
section at the same time.
Using
the same arrow
keys,
scroll
through
the
menus until menu #12
appears.
Use the arrow
keys
in the
ALARM
section to select
feet,
fath-
oms or meters.
Press the AUTO
key
to activate the
selection.
MENU
#13
-
SCALES
When
the Z-7200
is turned
on,
the
upper
and lower
range
limits
are
automatically displayed
on
the
right
side
of the
display.
To turn
them
off, press
both arrow
keys
in
the
RANGE section at the
same
time.
Using
the same arrow
keys,
scroll
through
the menus until
menu
#13
appears.
Use the
arrow
keys
in
the
ALARM section to select ON
or
OFF. Press the AUTO
key
to acti-
vate the selection.
12
25
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