Page 1

X-20A
INSTALLATION AND OPERATION
INSTRUCTIONS
INC.
LITHO IN U.S.A. 988-0105-36
•LOWRANCE
12000
E. SKELLY
ELECTRONICS,
DR.,
TULSA,
OK 74128
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Page 3

TABLE OF
CONTENTS
INTRODUCTION
INSTALLATION
POWER CONNECTIONS
KEYBOARD BASICS
OPERATION
SENSITIVITY
CHART
RANGE
ZOOM
DIGITAL
FISH I.D.
SPEED
FEATURE
AUTO
ALARMS
CHARTALARM
ALARM
FISH
SPEAKER
LIGHT
MODE
SIMULATOR
TRANSDUCERS
SIGNAL
FISH
WATER TEMPERATURE AND THERMOCLINES
SURVEYING
INTERPRETATION
ARCHES
AND CONE ANGLES
A LAKE
BAIT FISH
SPECIFICATION
SERVICE
TROUBLESHOOTING
INFORMATION
1
1
2
3
5
5
7
8
8
9
10
11
11
12
13
13
13
14
16
17
18
18
20
21
22
22
23
23
1991,
All
rights
Lowrance
reserved.
subject
Electronics,
to
change
in this manual are simulated.
Copyright
All features
©
and
specifications
All screens
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26
Inc.
without notice.
Page 4

4. The boat must be
is
motionless,
lines.
fish
stay
moving
in the
at
aslowtrolling speed
cone,
showing
ELECTRICAL NOISE
A
sonar's
completely
cause of sonar
major
display
is
problems
as random
electrical noise. This
patterns
of dots or
cover the screen with black
dots,
or not at all.
To
eliminate or minimize the effects of electrical
cause, With the boat at rest in the
electrical
on the sonar
the
equipment
display.
unit,
Nowturn on
the effect on the sonar's
the sonar
on the VHF radio and
been turned
If
you
or
power
interference. VHF radio antenna
certain to
unit's
display
on,
find noise interference
radio,
to isolate the
try
cable and transducer cable
keep
powercable directlyto
on the boat off. Make certain the
then turn ASP off. There should be a
each
display.
for noise. If no noise is
transmit.
their
effect on the sonar
problem.
the sonar's wires
water,
of electrical
piece
For
example,
Keep doing
from an electrical
You can
away
cables radiate noise when
awayfrom
the
batteryto
toseefish arches. If the boat
on the
display
as
usually
lines. In severe
or cause the unit
first
noise,
the
first
thing you
engine
steady
equipment
turn on the
present,
this until all electrical
display
noted,
instrument,
usually
from the
it. You
isolate it from
on the boat and view
bilge pump
turn the
then turned off.
trolling
re-route the sonar unit's
wiring
need to route the sonar
may
otherwiring
straight
horizontal
appears
cases,
on the
it can
operate erraticly,
to determine the
try
should do is turn all
is
also. Turn
off,
bottom
signal
on
and view
pump
equipment
motor,
that is
causing
transmitting,
has
pump.
the
so be
then turn
off,
on the boat.
If no noise
certain
Increase the RPM with the
the
problem
wiring.
power
the
battery
supplied
When no noise
noise source Is
experience
water,
displays
everything except
could be one of three
Try using resistorspark plugs, alternatorfilters,
cable
away
helps
with the unit when
make
orwhen the boat is at rest. In
will be the location and/or
must be
Read
placed
transducer owners
your
on the sonar unit from
the sonar
gearshift
in neutral. If
things;
from
engine wiring. Again, routing
eliminate noise
appears
probably
on the sonar unit after all of the
sonar installations which
hasty
problems.
the
wiring
cavitation.
nearly
of the
in a location that has a
angle
manual for the best
electrical
unit Is turned
noise
spark plugs,
equipment,
then start the
off,
appears
alternator,
or
routing
the
powercable directly
then make
engine.
on the
display,
ortachometer
the sonarunit's
Make certain to use the in-line fuse
cable to the
power
novices or
Many
all
cases,
transducer. The face of the transducer
smooth flow of water at all boat
battery.
above
tests,
persons
function
the cause of
mounting position.
perfectly
the malfunction
then the
with limited
in shallow
speeds.
to
25
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Page 5

Weak bottom
2. Electrical
the sonar to
This can cause the unit to eliminate
from the
3. The water
sonar can't find the bottom
flash
continuously.
are in. If this
you
to a realistic
range
move Into shallower
you
4.
Check
also
drops, reducing
echo, digital readings
noisefromthe boat's motorcan interfere wlththe sonar. This
automatically
display.
may
happens, place
one,
the
battery voltage.
increase its Discrimination
be
It
may change
than the sonar's
deeper
signal
(for example,
water,
a bottom
while it's in the
the unit in the manual mode,
if the
its
to find the bottom or
ability
erratic,
weakersignals
the
range
0-100
voltage drops,
or no fish
ability
automatic
to limits far
and increase the
feet)
should
signal
signals (cont4:
or noise
such
to
the unit's transmitter
targets.
rejection
as
oreven structure
fish
find the bottom. if the
the
mode,
greaterthan
then
change
sensitivity.
appear.
causes
feature.
will
digital
the water
the
As
power
INTRODUCTION
Welcome to the world of
a
high quality
sonar
sportfishing
designed
for both
This unit has an automatic feature
depth, fish,
and structure. As
can "fine tune" the unit to the
from
Although
board and
Read this manual
a
great
the
to
sonar.
your
the X-20A
operation
reference should
the more
water,
has
many
modes makes it
and take it with
you
your
become
you
surrounding
features and
you
need it. The more
X-20A can do for
sonar. Your Lowrance
professional
that finds and
familiar with
and novice users.
displays
your
conditions to
the
use and understand.
this unit. it makes
use
know when
easy
when
functions,
to
you
you
you!
X-20A is
bottom
the
X-20A, you
the most
get
simple key-
you get
Bottom
bottom echo while boat Is
1. The transducer
flow of water in order forthe sonar to work at all boat
water
other
echo
disrupt
targets.
disappears
may
the sonar
The technical term for this is 'Cavitation'.
at
high speeds
moving
be in turbulent water. It must be mounted
signals, interfering
or erratic
with its
speeds.
ability
dIgital
to find the bottom or
2. Electrical noise fromthe boat's motorcan Interfere with the
the sonar to
This can cause the unit to eliminate
from the
and transducer cables
No fish
1. Make certain
problem
automatically
display. Try using resistorspark plugs
arches when the Fish ID feature Is off:
transducer is
if a
partial
increase its Discrimination or noise
weakersignals
from other electrical
away
arch is
pointing straight
displayed.
See the Fish Arch section in this manual
such as fish oreven structure
or
down. This is the
routing
wiring
the
on the boat.
for more information.
2. The
sensitivity may
it has to be able to receive the fish's echo from the time
arch,
it leaves. if the
until
when it is in the center of the cone.
3. Use the Zoom feature,
in on a small
better luck
This
enlarges
range
seeing
the
not be
high enough.
sensitivity
is not
It is much easierto
of waterthan a
fish arches with
targets,
allowing
in orderforthe unit to
high enough,
display
one. For
large
a 30 to 60 foot
the
display
the unit
example, you
range
to show
displays
fish arches when zoomed
than a 0 to 60 foot
much more detail.
reading
or weak
in a smooth
Air bubbles in the
sonar. Thiscauses
rejection
sonar unit's
feature.
power
most common
a fish
display
it enters the cone
the fish
will have much
only
range.
INSTALLATION
Mounting
install the unit in
when tilted
wood screw
back of thin
there is
transducer
You can route
in the
up through
After
(RTV).
for the best
or
through
panels
enough
cables.
the
mounting
the hole. Then
routing
the
the bracket to cover the hole. Route the
Offset
convenient
any
to secure the
room behind the unit to
power
surface.
cables,
the slot in the rear of the
that can be
punched
out for
NOTCIII
location,
viewing angie.
bolt
mounting.
mounting
provided
Holes
Place a
hardware. Make certain
there is clearance
in the bracket base allow
piece
attach the
and transducer cables
First
push
the transducer
pass
the
power
through
cable
connector and cable
wire down
fill the hole with silicone rubber
bracket. There are two notches
more
cables,
if
necessary.
of
plywood
on the
power
a one inch hole
through
adhesive
cables
through
in the bracket
and
it.
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1
Page 6

Power
The X-20A
cable to an
electrical
Electrical interference shows as random dots on the
the boat's
The
negative
power
attaches to the
enough, splice ordinary
holder is as close to the
possible.
short. Use a
This unit has reverse
power
wires are attached
Connections
operates
accessory
interference,
engine
power
or
cable with the
or an
cable
ground.
has
Attach the in-line fuse holder to the red wire on the
crimp
battery
This
protects
3-amp
fuse.
wires are reversed.
correctly.)
from a 12
or
volt
power
battery system.
buss. If
then attach the cable
accessory
two
wires,
connector. The
or
#18
power
the
is on.
red is the
accessory
wire onto it. Be certain
gauge
source
cable and
power
buss.
(battery
polarity protection.
(However,
the unit will not work until the
have
you
directly
positive
other end of the fuse holder
If
the cable is not
or
accessory buss)
unit
your
No
damage
Attach the
problems
to the
display
power
with
battery.
whenever
lead and black is
long
that the fuse
as
in
the event of a
will occur if the
IMPORTANT
SERVICE
If
your
troubleshooting
tonierservice
the How To
SONAR TROUBLESHOOTING
Unit won't turn on:
1.
Check the
2. Make certain the
to
the
3. Check the fuse.
is
unit
not
working,
section before
department.
Obtain Service section on
cable's connection at the unit. Also check the
power
power
positive
battery terminal,
INFORMATION!
or if
you
contacting
It
maysave you
cable is wired
black to
need technical
a service center or the
the trouble of
26 if
page
properly.
negative
help, please
need service.
you
The red wire connects
or
ground.
use the
factory
returning yourunit.
following
cus-
See
wiring.
RED
FUSE
HOLDER
4. Measurethe
11 volts. It it
on the terminals are
Unit
freezes,
1. Electrical noise from the boat's
interfering
from other electrical
cable
directly
2.
Inspect
3. Check both the transducer and
securely plugged
Weak bottom
1. Make certain transducer is
transducer.
its effectiveness, If the transducer is mounted inside the
shooting through only
hull. Do NOT use RN silicone rubber adhesive or Marinete,e.
batteryvoltageatthe
the
isn't,
locks
withthe sonar unit.
to the
the transducer cable for
in to
echo,
Oil, dirt,
to the unit is
wiring
corroded,
up,
wiring
battery
the unit.
or the
or
operates erratIcally:
Re-routing
on the boat
instead of
digital readings erratic,
and fuel can cause
one
pointing straight
of
layer
unit'spowerconnector.
defective,
battery
motor,
trolling
the
may help.
through
breaks, cuts,
power
the
needs
motor,
powerand
Route the sonar unit's
a fuse block or
or
connectors,
or no fish
down. Clean the face of the
afilmto form on
fiberglass
and that it is
charging.
pinched
ltshould
batteryterminals orwiring
or an
accessory may
transducercables
wires.
Make
signals:
thetransducer, reducing
hull,
securely
be
atleast
be
away
power
ignition
certain both are
switch
be sure it is
bonded to the
2
23
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Page 7

thus
marked,
the
right spot.
lake. Unless
not be able to find it
BAIT FISH
can make
you
This is essential
mark the school
you
again.
your
turn
when
and come back to
you're
of fish when
far from shore
you're
fish in
over
exactly _.a1.J
on a
big
it,
may
you
The
importance
sized.
Bait fish are the
shad. Bait fish can also
bluegill,
Most bait fish concentrate within
promotes
of
will look like a 'cloud" on the unit's
nearby,
SPECIFICATIONS
Dimensions
Weight
Transmitter
Output
Receiver
Operating
Operating Voltage
Number of
Maximum Chart
Maximum
fishing
Display
They
and bass.
often
Power
Scroll
of bait fish to successful
are the
the
is to use the unit to find the
frequency
Sensitivity
Current
pixels
Digital Range
plankton
growth
directly
(typical)
Speed
Range
principal
of the
beneath the school
food of all
feeding forage
be the
young
five feet of the surface where
plankton
fishing
game
of
game
on which
bait fish first. A school of bait
display. Usually, game
can't be
fish in most
such as
fish,
fish,
they
over-empha-
minnows and
such as
One method
feed.
waters.
crappies,
sunlight
fish
of bait fish.
5 7/8"H x 7 3/4"W
1 3/4
pounds
192 kI-lz
275 waifs
34.4 watts RMS
82 db
200 ma
500 ma
9-15 vdc
50 x 27
(vertical x horizontal)
1350 Total
.5"
32"
180 feet
400 feet
peak
temperature
(lights off)
(lights on)
minute
per
minute
per
x 3 7/1 6"D
to
peak
stabilized
(minimum)
(maximum)
will
fish
be
KEYBOARD BASICS
This section
Operation
section for a detailed
a
fl
a
a
gives
ON OFF
These
keys
simply press
key.
Pressing any key generates
that the unit has
you
UP and DOWN ARROWS
These
function on the unit. Use these
ity,
keys
chart
brief
explanation
description
the unit's
turn
ON
the
are used to
speed, range,
key.
accepted
of the
each
of
on and off.
power
To turn it
a tone or
a command.
virtually every
adjust
keys
zoom and
keyboard.
key's operation.
To turn it
off,
press
"beep."
to
adjust
chart alarm.
Read the
on,
OFF
the
This tells
feature and
the
sensitiv-
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3
Page 8

-1
______
-
IUIi'I
•;hUtIa
SENS.
This
(The digital's sensitivity
cally.)
CHART SPEED
Vary
keys.
RANGE
The
keys.
(0-3
CHART ALARM
Using
the left side of the
justed.
top
and the arrow
key
The receiver has 32
the
speed
There are 5
depth range
The
meters to 0-90 meters - metric
this
Any target
and bottom of the chart alarm bar
of the chart with this
ranges varyfrom
activates the chart alarm. A bar
key
steps
is
changed
display
that
appears
keys adjust
is
adjusted
steps
of chart
when the chart alarm is ad-
the
graph's sensitivity.
the unit automati-
by
of
adjustment.
and the arrow
key
speed adjustment,
with
this
0-5 feet to 0-180 feet.
models)
and the arrow
key
appears
on the screen between the
triggers
the alarm.
on
other fish
during
ance than
Schooling
this
The
bottom.
warm and cool
thickness of the thermocline can
deep
are
active.
game
The X-20A can detect this invisible
will
SURVEYING A LAKE
eventually
the
summer. While some fish have a wider
others,
fish
temperature.
temperature
Layers
lakes there
important
Many
will
fish
probably
have to be turned
die out when stocked in lakes that remain too cold
each has a certain
suspended
We assume
over
deep
they
of water in the lake is seldom
of different
of water is called a thermocline. The
layer
be two or more at different
may
temperatures form,
vary
to fishermen because
times bait fish will be above the thermocline while
suspend
in or
just
below it.
up
temperature
within which it tries to
range
water lie atthe level that
are the most comfortable here.
constant from
and the
with the season or time of
depths.
are areas where fish are
they
layer
in the
water,
but the
provides
junction
depth
Thermoclines
sensitivity
to see it.
toler-
stay.
top
of
and
day.
larger
to
a
In
______
.Ip
•
________
MODE
The X-20A has five different "screens" or modes of
tion.
Use this
FISH l.D.
This
turns the Fish 1.0. feature off and on.
key
"'
AUTO
Turning
switch to the manual
return the unit to automatic at
AUTO
the unit on enables the automatic mode.
key again.
to switch between modes.
key
FISH ALARM
Press both the Fish 1.0. and the AUTO
the same time
This is an audible fish alarm.
mode,
activate the Fish Alarm.
to
the AUTO
press
any
time
key.
by pressing
You can
opera-
at
key
To
the
The most successful
after
day
that
produce
where,
season. And
any
throughout
other factors.
With the
the areas where fish are
lake!
The most efficient
survQy
indicate
As
you go
bottom. It will also reveal
a few marker
Keep
and
day
and at what
the
X-20A,
it with
your
the
promising spots
about
anglers
year
fish
consistently. They
depth, they
they
year depending
anyone
way
unit. Start with
your survey, your
buoys
the unit indicates a school of
on
any body
after
year.
can
realize
on
can
eliminate
to be. Even if it's the first time on
likely
to become
that
acquainted
of water are those who fish it
Eventually, they
discover
expect
water
a
to find the fish
these
productive
level, temperature, food,
guesswork
with a
of the
map
in relation to landmarks on shore.
will
unit
suspended
in
the
boat,
throw the
fish,
fish.
ready
tell
you
the
to toss overboard. When
buoy
learn the hot
through experience
they
areas
and concentrate on
of water is to
body
if
lake,
out. With the school
possible,
depth
and
spots
want at
change
and
the
and
of
type
4 21
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Page 9

WATER TEMPERATURE AND THERMOCLINES
OPERATION
Waler
temperature
the activities
the
always
colder
about a fourth
Most
narrow
identify
species.
temperature
water slows down their metabolisrri. At this
fish don't
limits. Surface
the desired surface water
Trout can't survive in streams
has an
important-if
not
controlling-influence upon
of all fish. Fish are cold blooded and
of the
as much food as
spawn
unless the water
temperature
surrounding
consume in the summer.
they
meters such as the
spawning
waler.
temperalure
temperatures
that
too warm. Bass and
gel
SURFACE
ABSORBS HEAT
FROM THE SUN
their bodies are
lhe
During
time, they
winter,
need
is within rather
LDT-3000
LAVER
helps
for various
83°
7B°
770
SENSITIVITY
The unit is in the AUTO SEARCH
micro-computer
and lock onto the bottom.
automatically adjusts
The
digital depth
locks onto the bottom. You can
mode or
You
manually adjust
need to increase the
may
unit is in automatic. To do
'SENS" will flash on the
on the left side of the screen.
level. To increase the
tivity
until the
creases
moves as
increased.
finished
ity
sensitivity
setting
bar will
sensitivity
you
You'll also see the
disappear
is at the desired
in the same manner. Notice how the
change settings.
the
sensitivity
after
suit conditions.
it to
sensitivity
first
this,
side of the
right
See
(
sensitivity, press
level,
seconds.
eight
mode when it's first
the
sensitivity
turned on. The
and
flashes "0" until it
leave the
sensitivity
to show fish
the SENS.
press
display.
below.)
level. The down arrow
It will move
change
This indicates the sensi-
and hold the
up
on the
in the automatic
symbols
key.
A vertical bar
when the
display.
the letters "SENS" and the
to find
range
finds and
when
The letters
appears
arrow
up
key
sensitivity
sensitivity
After
you've
sensitiv-
the
key
de-
bar
is
EPILIMNION
760
SENSITIVITY
BAR
THERMOCLINE
75°
68°
Most PRODUCTIVE
ZONE FOR FISHING
56°
VARIES IN DEPTh
DUE TO
WIND,
50°
47°
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20
5
Page 10

With
high sensitivity settings,
appear.
the surface of the water. Then it makes a second
back
This is normal. It's caused
again.
a second bottom echo
the
by
returning signal
(second
to the bottom and
trip
echo) may
reflecting
U
AUTO
SENS
RANGE
off
.—
BOAT'S DIRECTION OF TRAVEL
SENSrnVITY
BAR
N
Remember,
sitivity automatically adjusts
computer places
the bottom
up
level while the unit is in automatic. This
level is not
ity
will
increase the
level
you programmed.
To
adjust
SENS.
down arrow
sensitivity
chosen.
You can
manual mode.
when the unit's
the
Then
key.
key
bar moVes
adjust
I-
14.:
automatic feature is
to the
it at a level
signal. However,
high enough
sensitivity
sensitivity
press
to decrease
the
sensitivity
slightly
to show
to
while the unit is in
either the
or
up
4L
surrounding
above the minimum
it's
possible
be desirable
may
fish or other small detail. The unit
pick up
down,
in the
the bottom
automatic,
arrow
up
it. As
you press
according
same manner when the unit is
6
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20
FISH ID
EU
the receiver's sen-
on,
conditions. The micro-
to
sensitivity
the sensitiv-
or the
it,
key,
in
to
change
signal,
to increase
key
the arrow
to
the
required
the
if
then add in
simply press
sensitivity
pick
the
the
the
level
the
small fish
Very
a
partial arch,
fish will
Large
• arch.
thermoclines, etc.,
enough
One of
segment
segment,
turn
on
display
Because of water
the
the screen. In medium to
.
.
A
probably
or a
arch,
to
fish arches.
get
the best
of the water. For
the better the screen
sensitivity up
fish
arches.
will not arch at all. Medium
shape
but turn the
the
to
ways
as
high
•:
U
B
similar to an arch if
sensitivity up
conditions,
sensitivity
fish arches is to
get
example,
resolution
as
deep water,
such as
sometimes
from 45 to 60
possible
19
will
without
.
sized fish
they're
in
deeper
heavy
cannot be increased
be. For the best
getting
this method should work to
in
water to see the
surface
expand
feet. The smaller the
or "zoom" a
too much noise
C
will
deep
.
show
water.
clutter,
results,
Page 11

Both 8
ings,
model. This is because
ber,
of the
degree
even
though
the shallow
tells
signal
and
edge
you
20
degree
bottom
the
of the
whether
you
are
signal
SIGNAL INTERPRETATION
Your unit
A bottom of firm
ing.
bottom
signal.
rows , then it means that
absorbs the sound wave and
sensitivity
rocks or
Big
the bottom level
target's height.
short line
an accurate
gives
If the automatic
to see a better
signal.
As
you pass
above
on
stumps
extending
picture
sand, gravel,
you
bottom
a smooth bottom send back
The
over a
the bottom
transducers
much wider on the 20
is
signal
seeing
more
shows
are over
you
of the bottom that
shell,
accurate bottom read-
give
of the bottom. Remem-
true
the
you
rocks, mud,
or hard
depth.
etc.
your
returns a wide
clay
feature is off and the bottom
have moved over a mud
returns a weak
signal.
height
of the
post,
signal.
ft should be
signal.
signal
signals
depends
clearly
degree
The rest
boat is
bottom. Mud
Turn
pass-
signal
up
above
nar-
the
on the
visible as a
power
right
SPEED
the chart
on,
CHART SPEED
the
side of the
CHART
At
speed, press
the
side of the screen.
the
down arrow
speed,
chart
arrow
up
release .the
speed
key
to decrease ft. When the
key
reaches its maximum
a tone.
speed
display.
scrolls at
A vertical
a
preset speed.
The word "CHART"
key.
bar will also
This indicates the current
if
wish to increase
you
There are five
key.
steps
or minimum
To
change
will flash on
on the
Next,
press
Press the
chart
the chart
appear
speed.
speed.
chart reaches the desired
of chart
level,
speed.
the unit
When the
will sound
the
left
A
steep slope
returned from a
Brush
usually
the bottom
their
signal
FISH ARCHES
returns a
high
lies on the bottom
signal.
is not as
Fish arches are created
The distance to a fish
the next
distance is
distance increases
page.
When the
size and
example,
displayed
diameter
shape
if the cone
on the unit
and the resolution limitations of the
When the
shorter,
Fish l.D. feature is
of the fish arch due to
wide
signal,
underwater
Brush
signals
strong
as rock.
when the cone of sound
when the cone first strikes
center of the cone strikes
as shown
again
in "B". As the cone
shown in "C".
as
off,
passes
may
over a fish in shallow
not arch
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the
steeper
cliff are
usually
and shows
look similar to
the
depth
the cone
at all. This is due to the narrow
18
the wider.
Signals
the widest of all.
as
clumps rising
up
large
rocks;
passes
above
however
over a fish.
it is shown as "A" on
the
fish,
leaves the
fish,
of the water will affect
diameter.
angle
water,
display!
the
the
the
the
For
signal
cone
To view the chart
The chart
key.
speed
speed
bar
At times it is desirable
echo before it scrolls off
SPEED
and CHART SPEED
chart
speed selling.
be
displayed.
mode.
at the same time
keys
The
keys again
If the
digital
without
to
changing
will
appear
or "freeze" the
stop
the screen.
will freeze the
to start the
digital
does not
it,
press
for
eight
seconds.
display
Pressing
the SENS. and
display.
display moving
sonar is
stop
the bottom
on,
when the chart is in the
7
the CHART
to examine an
Press the
at
depth
SPEED
CHART
SENS.
the last
will still
"freeze"
Page 12

RANGE
The
range automatically changes
display
when the unit is in the automatic mode. The
manual mode. There are six
180 feet.
range,
key.
press
arrow
eight
when the unit is in
(Metric
first make certain the word AUTO
The word RANGE will
the
up
for a
key
seconds after the last
units:
arrow
key
deeper range.
automatic. The
0-3, 6, 15, 30,
flash on the
to switch to a shallower
key
ranges
The
was
to
keep
available:
and 45
off.
is
right
annunciator will
range
pressed.
U
AUTO
RANGE
-
20
the bottom
range
range
0-5, 15, 30, 60, 120,
meters.)
Then
side of the screen.
range
signal
cannot be
can be
To
press
or
press
changed
change
the RANGE
stop
the down
on the
changed
in
and
the
Next,
flashing
30
AUTO
Lw
ZOOM
TRANSDUCERS AND CONE ANGLES
The
sound waves from the transducer
cone
shaped
The
angle
Lowrance offers a choice of transducers with either an 8 or 20
cone
angle.
ideal for
cone
angle
of water the 20
8
degree
The 20
the 8
water,
feet
(300
more desirable. Since the sound
it can
area,
beam. This looks much like the beam from
between the outside
Typically,
operating
allows
degree
transducer
degree
transducer is
degree mostly
-
fresh
water,
penetrate
wide cone
in
shallow to medium water
to see more of the underwater world. In 15
you
cone
covers
100 feet
to much
edges
covers an area about six feet across.
about a two foot circle.
only
almost
in
salt water. In a
-
deeper depths.
spread
of the
angle
always
salt
water)
energy
out into the water in a
a
flashlight.
cone is the cone
transducers
the best to use in fresh
deep
the narrow cone
is concentrated in a smaller
depths.
water
(20 degrees)
The 20
environment,
angle.
degree
degree
feet
The
angle
are
is
FISH ID
Lw
FISH ID
50
EU
50'
100'
150'
ZOOM
Use the Zoom feature to increase the size of the
It works
example,
new
be
1)
will be 10-15'.
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-
Automatic
by enlarging
if the
will be 30 - 60 feet. If the unit is in
range
tracked in this 30 foot window. There are two
If
you're
on the 0-15'
operation
the bottom half of the selected
-
is 0
range
There is no zoom on the 0-5'
2)
60
range
and the zoom
feet
and
press
8
automatic,
the zoom
targets
is
key
exceptions
key,
range.
on the
display.
range.
pressed,
For
the
the bottom will
to this nile:
the new
range
20
Degrees
17
200'
8
Degrees
Page 13

MODE 5
Speed
In this mode the chart scrolls
at
high speed.
speed
the CHART SPEED
desired.
-
All
Scroll.
can be
chart,
The chart
adjusted
High
with
key
To
change
"ZOOM" flashes on the
arrow or the down arrow
For
example,
•10
AUTO
if
RANGE
the
range
the
up
Press the
To turn the zoom feature
the zoom
if
the
to 30-60 feet.
arrow
key.
arrow
up
range,
range
This
changes
key again,
first
side of the screen.. Now
right
to increase or decrease the zoom size.
key
is 0-60
While the word "ZOOM' is still
feet, pressing
the
and the zoom
off, simply press
press
zoom
the ZOOM
the ZOOM
from 30 feet to 15
range
range changes
the RANGE
The word
key.
the
press
key changes
flashing, press
to five feet.
key
up
feet.
Chart uses full screen.
a)
No
b)
digital depth
No FASTRAK.
c)
No automatic
d)
lowed.
No Fish l.D. feature or
e)
Fish Alarm
Chart alarm is allowed.
f)
SIMULATOR
Your unit has a built-in simulator. All that is
to
operate
be connected to the unit.
To start the
press
same
down,
signal
bottom
None
simulator
To turn the
is a 12 volt D.C. source. The transducer doesn't
simulator,
any key, (except
time. The easiest
then
press
across the screen and the
depth.
of
unit's features are accessible when the unit is
the
mode.
simulator
indicator.
operation
the ON
al-
first make certain the unit is turned
the OFF
way
off, press
key)
to do this is to
The unit should start
key.
the OFF
-.
and
digital depth
key.
required
press
press
display
___LID
for the simulator
the ON
key
and hold
scrolling
should
20
have to
off. Now
at the
a
key
a chart
show a
in
the
ZOOM
Zoom
press
the automatic zoom feature.
range
range
up
the unit is on the 0-60 foot
manual mode is
key,
move the 30-60'
way
range
zoom
displayed
ample,
you
above
feet. Now
press
appears.
zoom window around the bottom
DIGITAL
Built inside the Fish l.D. II is a
discriminates between the valid bottom echoes and false echoes
fish, thermoclines,
the bottom
on" to the
-
Manual Mode
operates differently
the ZOOM
shifts in one foot increments.
down in one foot increments.
key.
when the unit is
The bottom half of the
in one foot increments. For
range,
on,
pressing
then the down arrow
range
key
to 31 '-61'. The best
to use this feature is to
to a smaller
shift the
key,
that
you
if the bottom
wish to
enlarge
first
it,
the down arrow
change
press
Now
depth.
bottom.signal.
want zoomed.
the zoom
you
or other
At
then
one,
until
range
is 50
depth
the area
the
range
key. Finally,
until
key
have a fifteen
signals.
on,
power
in the manual mode. First
is
range
However,
example,
the zoom
once
change
press
if
you
The down arrow
The
and the _______________________
arrow
up
if
________ _____
will
the
the
press
key
enlarged, just
an arrow
to shifts the
key
shifts the
the area is
For ex-
and
feet,
immediately
to 0-30
the bottom
foot
signal.
complete digital
The
the
digital
_____________________
sonar. It
digital display
flashes "0" until
automatically
will show
it has "locked
key,
like
the
range
AUTO
RANGE
ASH ID
Lw
Eu
from
only
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16
9
Page 14

FISH I.D.
The Fish 1.0. feature is
The
computer
signals.
desirable
Targets
medium,
shown
Fish l.D. feature can
according
or back on
when the unit is in
1.0. feature.
To show fish
There should be some movement of the
boat for the Fish 1.0. feature to work
properly.
If
have
you
bols, try increasing
inside the
It
helps
signals.
that are identified
or
large
again, press
symbols, you
difficulty showing
automatically
unit
analyzes
eliminate surface
The
remaining suspended targets
by
fish
symbols
to the relative size of the fish as seen
be used in automatic. If
only
the FISH I.D.
manual,
the
it will
must be
fish
sensitivity.
on when the unit is first turned on.
all
clutter, thermoclines,
the unit as fish are
on
the
key.
it in automatic and enable the Fish
put
traveling
sym-
echoes,
display.
If
filtering
you
you press
at a slow
_____________________
________ _____
out unwanted
and other un-
are
usually
displayed
These
symbols
the unit. The
by
wish to turn it
FISH 1.0.
the
trolling speed.
as
-
fish.
small,
are
off,
key
AUTO
RANGE
20
MODE 3-
The
a)
use the lower
display.
played
99.9
in whole
No
b)
Big digital.
digital depth
The
in tenths of a foot to
then it is
feet,
numbers.
FASTRAK,
numbers
quarter
depth
displayed
£1
AUTO
RANGE
of the
is dis-
Is
PIE
FISH l.D. FEATURE ON
EQ
-
Depth
in
large digits.
display.
only
83'I
15
NOTE: The Fish 1.0. feature cannot
suspended objects
or other inanimate
floats,
phisticated,
ual tree branches
be mis-identified as fish
noise can fool the Fish ID. feature. This is
transducer installation.
Although
fisherman.
but it can be fooled. The most difficult
the Fish 1.0. feature isn't
such as
extending
turtles,
objects.
out from
the Fish 1.0. feature.
by
distinguish
tree
branches, trotlines,
The
micro-computer
groups
perfect,
10
it can be a valuable aid to the
between fish and other
submerged
in this unit is so-
challenge
is individ-
of branches. These can
Also,
usually
amounts of
large
caused
by a poor
MODE 4
displayed
No chart
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Page 15

MODE
The X-20A has five different screen
the MODE
appears. A summary
MODE 1
fault mode used when the
unit is first turned on. It has
the
following
Small
a)
play
does not show tenths of a
foot. Normal chart
No FASTRAK.
b)
key. Keep pressing
01 the different screen modes follows.
-
This is the de-
features:
digital depth
in lower left corner. It
dis-
display.
the MODE
modes. To
key
-
change
until the desired screen
modes,
press
a
AUTO
RANGE
2f1
FISH ID
60
AUTO
When the unit is first turned
works
and
ity
automatically
range
to find
are also
adjusted
on,
and
the automatic
keep
the bottom
the
display
to
at all times. To turn the automatic feature
once. The word
key
the automatic
turns the Fish l.D. feature off at the same time. The
To return the unit to the automatic
will
This
or other detail. This will not turn the Fish l.D. feature on. You will have
to
press
reset the
Fish l.D.
the
"AUTO" will
sensitivity
sensitivity,
key
disappear
and chart
so
range
mode,
you may
to turn it on.
wish to increase it to see
feature is enabled. It
depth.
bottom
off, simply press
features are off. This also
press
signal
from the
the AUTO
-
The sensitiv-
on the screen
the AUTO
display, signifying
digital
remains
key
AUTOMAI1C
MODE ON
on.
again.
fish
MODE 2
as mode 1
FASTRAK. This
the
It converts all echoes to hori-
zontal bars when
appear
gives a rapid update
ditions
boat. Echoes are also
scrolled
display.
ture is not available with this
mode.
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.
This is the same
except
displays
side of the screen.
right
they
on the screen. This
directly
normally
The Fish l.D. fea-
under the
across the
it has
on
first
of con-
-.
14 11
i0
AUTO
RANGE
20
—
_40
ISO
ALARMS
The unit
chart alarm consists of a bar that
The alarm
boundaries of the bar.
Fish Alarm sounds an audible
objects
To
chart alarm. Both alarms
has two
are detected. It works in
separate
different
"chirps"
the
alarms,
whenever the unit detects an echo inside the
alarms,
the fish alarm's
be used at the same time.
may
a chart alarm and fish alarm. The
displays
alarm when fish or other
conjunction
on the left side of the screen.
suspended
with the
tone sounds different than the
Fish l.D. feature.
Page 16

CHART ALARM
To set the Chart
The words " Chart Alarm" flashes in the lower
A
vertical bar also
the screen for
adjusting
between the
deep
shallow end is
by
move the bottom of the bar
shallower.
will
it.
end of this bar to make a smaller or
surface clutter or other
disappear.
Alarm,
displays
seconds or for
eight
This is the Chart Alarm's "window."
and bottom of this bar
top
automatically adjusted by
seconds after the last button is
Eight
the CHART ALARM
press
on the left side of the screen. It
seconds after
eight
will
larger
unit so it won't be
the
false
signals. Next, press
deeper,
or
press
E
on the
key
corner of the screen.
right
you
echo that
Any
sound the alarm.
alarm "window." The
the down arrow to
the
up
pressed,
keyboard.
will
have finished
appears
triggered
arrow to move it
the alarm bar
0
AUTO
RANGE
20
FISH ID
on
stay
Adjust
To turn the Chart Alarm
the bottom of the
arrow
key.
FISH ALARM
the FISH ALARM for a distinctive audible alarm when fish or
Use
susupended objects
1.0. and the AUTO
FiSH
ALARM"
alarm sounds each time the Fish ID. feature detects a fish or
suspended object..
To turn the Fish Alarm
same time.
SPEAKER
The
arrow
appears
when
unit
turned off.
displays
(Audio)
speaker
keys
can be turned on
at the same time.
on the
right
the unit is turned
will
still sound a tone when
off,
bar all the
are detected
keys
at the bottom
There is a different tone for each fish
off, press
center side of the
on. NOTE: This
the CHART ALARM
press
to its shallowest
way
the FISH 1.0. feature. Press the
by
at the same time. The words "FISH
side of the screen. The
right
the FISH
and off
Whenever it is
a
by pressing
display.
applies
is
key
pressed
position using
1.0. and AUTO
enabled,
The
speaker
to the alarms
and the
key,
the
a note
then move
audible
symbol
keys
and down
up
symbol
is enabled
only.
speaker
the
up
other
other
size.
at the
The
is
LIGHT
A
the
at the same time and the
the RANGE and ZOOM
unit is turned off.
light
lights
allows
operation
of the unit at
to flash for six seconds. Press the RANGE and ZOOM
keys again.
C)
lights
night. Turning
will
stay
The
the unit on causes
on. To turn the
will also
lights
off,
lights
out when the
go
keys
press
When
the "Chart Alarm"
view the Chart Alarm
bar will be
left side of
trigger
displayed
the screen
the alarm.
is
signal
bar,
simply press
for
eight
in
the area covered
on,
seconds.
CHART
ALARM
60
the alarm is active. If
CHART ALARM
the
Any target
by
that
appears
the chart alarm
you
key.
wish to
The
on the
bar will
1,
If the
since it does not track
range
is
changed,
the Chart Alarm
range settings.
12 13
may
need to be
changed
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also