Menus
change depending
on
the mode the unit is in. For
example,
if
the automatic mode is turned
off,
the
sensitivity
menu
changes
from
"AUTO
SENS" to "MAN SENS." Other
messages may
appear
in
menu
boxes or new menus can
appear, again depending
on
previous
selections.
OPERATION
AUTOMATIC
When
the
Magna
is first turned
on,
the
automatic feature is enabled. This feature
automatically adjusts
the unit's
range
and
sensitivity according
to water conditions. It
always keeps
the bottom
depth displayed
in the lower
portion
of the
screen.
To turn the automatic feature
off,
press
the
menu
key
until the AUTO/MAN
menu
appears.
Now
press
the down
arrow
key.
This
highlights
the letters "MAN." The unit
is now in the manual mode.
Wait a few
seconds and the menu will scroll off the
screen's left side.
Pressing
the ON/CLEAR
key
also
clears it. To turn
the automatic feature on
again, repeat
the
above
steps,
except
this
time
press
the
up
arrow
key.
RANGE
You
can't
adjust
the
range
when the
Magna
is in the automatic mode. It is
adjustable
when the unit is in the manual
mode,
however. To do
so,
first
put
the unit
in
the manual mode. Now
press
the ON/
CLEAR
key
to clear the screen. Then
press
the menu
key
until the
"RANGE
SEL"
menu
appears
as shown.
The
current
range
shows at the bottom of the
menu. In this
case,
the
range
is
60 feet.
Now
press
the
up
arrow
key
to decrease
the
range,
the down arrow
key
increases
the
range.
After
you
select the desired
Both 8
degree
and 20
degree
transducers
give
accurate bottom read-
ings,
even
though
the bottom
signal
is much wider on the 20
degree
model. This is because
you
are
seeing
more of the bottom. Remem-
ber,
the shallow
edge
of the
signal
shows
you
the
true
depth.
The
rest of the
signal
tells
you
whether
you
are over
rocks, mud,
etc.
SIGNAL INTERPRETATION
Your
Magna
gives
an accurate
picture
of the bottom that
your
boat is
passing.
A bottom
of
firm
sand, gravel, shell,
or hard
clay
returns a
fairly
wide
signal.
If
the automatic mode is off and the
signal
narrows
down,
then it means
that
you
have moved over a mud bottom. Mud
absorbs the sound
wave and returns a weak
signal.
Turn
up
the
sensitivity
to see a better bottom
signal.
Big
rocks or
stumps
on a smooth bottom send back
signals
above the
bottom level
signal.
The
height
of the
signal depends
on the
target's
height.
As
you pass
over a
post,
it should be
clearly
visible as a short
line
extending
above the bottom
signal.
A
steep slope
returns a wide
signal,
the
steeper
the wider.
Signals
returned from a
high
underwater cliff are
usually
the widest of all.
AUTO
6
19
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