Manual Lowrance X-55 (page 12 of 20) (English)

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is in the manual mode. To

turn Automatic

on,

press

the AUTO

key

again,

then

press

the

right

arrow

key.

SENSITIVITY

The

sensitivity key

the X-55 controls the

ability

of the unit to

pick up

echoes. A low

sensitivity

level

excludes much of the bottom

information,

fish

signals,

and other

target

information.

High sensitivity

levels enables

you

to seethis

detail,

but it can also clutterthe screen with

many

undesired

signals. Typically,

the best

sensitivity

level shows a

good

solid bottom

signal

with

Grayline

and some surface clutter.

When the X-55 is in the

Automatic

mode,

the

sensitivity

automatically

adjusted

keep

a solid bottom

signal displayed, plus

a little more. This

gives

it the

capability

show fish and other detail.

However,

situations occur where it becomes

necessary

to increase or

decrease the

sensitivity.

This

typically happens

when

you

wish to see

detail,

so an

increase in

sensitivity

is indicated. The

procedure

adjust

the same whether the unit is in the automatic or manual mode.

adjustthe

sensitivity, press

the SENS

key.

The

sensitivity adjust

appears

at the bottom of

the screen.

The

sensitivity

menu has left

and

right

arrows,

plus

a hori-

zontal bar

graph.

The

graph

gives

a visual indication of the

sensitivity

level. The number

above the INC arrow also

shows the

percentage

of sen-

sitivity

in use.

To increase the

sensitivity

level,

press

the

right

arrow

key.

you press

the

key,

the menu's

bar

graph

will

grow

wider and

the

percentage

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 left arrow.

The bar

graph

and

percentage

will decrease. When the

sensitivity

is atthe

desired

level,

release the

key.

When

you

reach either the maximum or minimum

limit,

a tone sounds.

However,

there are times when

you

may

want to turn the ASP feature off.

This allows

you

to view all

incoming

echoes before

they

are

processed by

the ASP feature.

change

the ASP

level, press

the MENU

key

five times. Then

press

the

key

next to the "ADJUST LEVEL

OF CHART ASP" label until the desired

level is obtained.

SIGNAL INTERPRETATION

Your X-55

gives

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.

the automatic mode is off and the

signal

narrows

down,

then

it means that

you

have moved

overa mud bottom. Mud absorbs the sound

wave and returns a weak

signal.

Turn

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.

you pass

over a

post,

it should be

clearly

visible as a short line

extending

above the bottom

signal.

steep slope

returns a wide

signal,

the

steeper

the wider.

Signals

returned from a

high

underwater cliff are

usually

the widest of all.

When the Fish ID. mode is

off,

the

depth

of the water will affect the size

and

shape

of the fish arch due to the cone

angle

diameter. For

example,

if the cone

passes

overafish in shallow

water,

the

signal

displayed

on the

X-55

may

not arch at all. This is due to the narrow

cone diameter and the

resolution limitations of the

display.

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Lowrance X-55 Manual

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