Bedienungsanleitung Lowrance X-20A (Seite 11 von 16) (Englisch)

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Both 8

degree

and

degree

transducers

give

accurate bottom read-

ings,

even

though

the

bottom

signal

much wider on the 20

degree

model. This is because

you

are

seeing

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 unit

gives

an accurate

picture

of the bottom that

your

boat is

pass-

ing.

A bottom of firm

sand, gravel,

shell,

or hard

clay

returns a wide

bottom

signal.

If the automatic

feature is off and the bottom

signal

nar-

rows

then it means that

you

have moved over a 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

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,

ft 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.

Brush

usually

lies on the bottom

and shows

clumps rising

above

the bottom

signal.

Brush

signals

look similar to

large

rocks;

however

their

signal

is not as

strong

as rock.

FISH ARCHES

Fish arches are created

when the cone of sound

passes

over a fish.

The distance to a fish

when the cone first strikes

it is shown as "A" on

the next

page.

When the

center of the cone strikes

the

fish,

the

distance is

shorter,

as shown

in "B". As the cone

leaves the

fish,

the

distance increases

again

shown in "C".

When the

Fish l.D. feature 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 unit

may

not arch

at all. This is due to the narrow

cone

diameter

and the resolution limitations of the

display!

CHART

SPEED

power

on,

the chart

speed

scrolls at

preset speed.

change

the

speed, press

the

CHART SPEED

key.

The word "CHART"

will flash on

the

right

side of the

display.

A vertical

bar will also

appear

on the

left

side of the screen.

This indicates the current

chart

speed.

Next,

press

the

arrow

key

you

wish to increase

the chart

speed.

Press the

down arrow

key

to decrease ft. When the

chart reaches the desired

speed,

release .the

key.

There are five

steps

of chart

speed.

When the

chart

speed

reaches its maximum

or minimum

level,

the unit

will sound

a tone.

To view the chart

speed

without

changing

it,

press

the CHART

SPEED

key.

The chart

speed

bar

will

appear

for

eight

seconds.

At times it is desirable

stop

or "freeze" the

display

to examine an

echo before it scrolls off

the screen.

Pressing

the SENS. and

CHART

SPEED

keys

at the same time

will freeze the

display.

Press the

SENS.

and CHART SPEED

keys again

to start the

display moving

the last

chart

speed selling.

If the

digital

sonar is

on,

the bottom

depth

will still

displayed.

The

digital

does not

stop

when the chart is in the

"freeze"

mode.

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