Manual Lowrance X-55A (page 16 of 28) (English)

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SENSITIVITY

Big

rocks or

stumps

on a smooth bottom send back

signals

above

the

The

sensitivity key

on the X-55A 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 see this

detail,

but itcan 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-55A

is in the Automatic

mode,

the

sensitivity

automatically

adjusted

keep

a solid bottom

signal

displayed, plus

a little more. This

gives

it the

capability

to show fish and other detail.

However,

situations occur where it

becomes

necessary

to increase or

decreasethe

sensitivity.

This

typically happenswhen you

wish to see more

detail,

so an increase in

sensitivity

is indicated. The

procedure

adjust

is the same whether the unit is

the

automatic or manual mode.

adjust

the

sensitivity, press

the SENS

key.

The

sensitivity adjust

appears

at the bottom of the screen.

The

sensitivity

has left and

right arrows, plus

a horizontal bar

graph.

The

graph gives

a visual indication of the

sensitivity

level. The number

above the INC arrow

also

shows

the

percentage

sensitivity

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 at the

desired

level,

release the

key.

When

you

reach either the

maximum or

minimum

limit,

tone

sounds.

bottom

level

signal.

The

height

of the

signal depends

thetarget's

height.

Asyou

pass

overa

post,

it should be

clearlyvisible

as a short

lineextending

above the bottom

signal.

Asteep slope

returns a wide

signal,

the

steeperthewider. Signals

returned

from a

high

underwater cliff are

usually

the widest of all.

WATER TEMPERATURE AND THERMOCLINES

Water

temperature

has an

important-if

not

controlling-influence upon

the

activities of all fish. Fish are cold blooded and

their bodies are

always

the

temperature

of the

surrounding

water.

During

the

winter,

colder water

slows down their metabolism. At this

time,

they

need about a

fourth as

much food as

they

consume in the summer.

Most

fish don't

spawn

unlessthe

watertemperature

is within rathernarrow

limits. A surface

temperature

meter

helps identify

the

desired surface

water

spawning temperatures

for various

species.

Trout

can't survive in

streams

that

get

too warm. Bass and other

fish

eventually

die out when

stocked in lakes that remain too cold

during

the

summer. While some fish

have a

widertemperature

tolerance than

others,

each has a certain

range

within

which it tries to

stay. Schooling

fish

suspended

over

deep

water lie

at the level that

provides

this

temperature.

We assume

they

are the most

comfortable

here.

Thetemperature

of water in the lake is seldom constantfrom

topto

bottom.

(See

the

picture

on the next

page.) Layers

different

temperatures

form,

and the

junction

of a warm and cool

layer

of water is

called a thermocline.

The

depth

and thickness of the thermocline can

vary

with the season or

time

day.

deep

lakes there

may

be two

or more at different

depths.

Thermoclines are

important

to fishermen because

they

are areas where

fish are active.

Many

times bait fish will be above

the thermocline while

larger game

fish will

suspend

in or

just

below it.

The X-55A can detectthis invisible

layer

in the

water,

butthe

sensitivitywill

probably

have to be turned

see it.

When the Fish l.D. 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

over a fish in shallow

water,

the

signal displayed

on the

X-55A

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-55A Manual

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