Lowrance electronic X-3 A

AUTO RANGE WITH ZOOM BOTTOM TRACK

An optional

Auto Range

feature is AUTO RANGE with ZOOM BOTTOM

TRACK. When the X-3 is in the

auto-range mode, it

picks

a lower limit

range that will keep the bottom signal in the lower 4/5 of the screen. The

upper limit is normally

set to zero,

unless you have changed it However,

a "window" can be used to "zoom" or expand the area near the bottom

and track it as the bottom rises or falls.

For example, suppose

the bottom is 85 feet deep.

To display

a 50 foot

window around the

bottom, press 5-0-2nd-8. The X-3 will choose an

upper and lower limit that will place

the

bottom signal in a

fifty foot win-

dow. The

upper

limit of the display may read 45

feet while the lower limit

may change

to 95 feet. The bottom will

be tracked and always kept inside

this window as it

goes deeper

or shallower This is useful if

you wish to

expand

or "zoom" the lower section of

the display

without disabling

the

auto-range

function.

NOTE

The

upper

and lower limits cannot be changed when the X-3 is in the

Auto Range

with Zoom Bottom Track mode.

To exit from the Zoom Bottom

Track, press 2nd-B. This will turn off Auto

Ranging, also. To return to Auto

Range only,

press

2nd-8

again.

CHART ALARM

The chart alarm can be

thought of as a fish alarm. It wil sound whenever

an echo is detected

(such as a

fish, or a school of

fish) inside its window.

To set the chart alarm, press

the SELECT key on the alarm section of the

keyboard.

The words CHART ALARM will be displayed

in the lower left

corner of the screen. To view the Chart Alarm setting, press either SHAL-

LOW SET or DEEP SET

keys.

A vertical bar will be displayed

on the left

side of the screen. This is the alarm "window".

Any

echo that

appears

between the

top

and bottom of the bar will sound the alarm. Both shaDow

and deep ends of the bar may

adjusted to make a smaller or larger

alarm "window".

CHART

ALARM

BAR

"WINDOW'

CHART

ALARM

ANNUNCIATOR

Figure 11

To adjust the

top (or shallow) alarm, press

the SHALLOW SET key, then

press the

arrow key

to move the

top

of the

window up, or the down

arrow key to move the

top of the window deeper

The bottom part

of the

alarm

window is set

in the same

manner Press the DEEP SET

key, then

press either the

arrow key to make the bottom part

of the window

move shallow,

or press the down arrow key to move the bottom of the

window deeper

After

you release the keys,

the bar will remain on the

screen for six seconds and then disappear If

you wish to view the chart

alarm bar at anytime, make certain that the CHART ALARM annunciator

visable,

then press

either

SHALLOW

SET or DEEP SET

keys and the

bar will be

displayed

for another six seconds.

21 14

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ALARM RANGING

35 AUTO.

RANGING

Figure 19

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