Manual Lowrance LMS-160 - GlobalMap 1600 (page 67 of 92) (English)

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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 left arrow key. 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, a

tone sounds.

To erase the menu, press the EXIT key.

GRAYLINE

GRAYLINE lets you distinguish between strong and weak echoes. It “paints”

gray on targets that are stronger than a preset value. This allows you to

tell the difference between a hard and soft bottom. For example, a soft,

muddy or weedy bottom returns a weaker signal which is shown with a

narrow or no gray line. A hard bottom returns a strong signal which causes

a wide gray line.

If you have two signals of equal size, one with gray and the other without,

then the target with gray is the stronger signal. This helps distinguish weeds

from trees on the bottom, or fish from structure.

GRAYLINE is adjustable. Since GRAYLINE shows the difference between

strong and weak signals, adjusting the sensitivity may require a different

GRAYLINE level, also. The level chosen by the unit at power on is usually

adequate for most conditions. Experiment with your unit to find the

GRAYLINE setting that’s best for you.

To adjust the GRAYLINE level, press the MENU key, then select “SONAR

OPTIONS”. The screen at the bottom of the previous page appears. Use

the up or down arrow keys to select the GRAYLINE menu. Press the left

arrow key to decrease the gray level or the right arrow key to increase it.

The percentage of GRAYLINE in use changes as the arrow keys are

pressed. The bar chart also gives a graphical indication of the GRAYLINE

level. You can see the change on the screen (both on the menu and on the

chart record) as you press the keys. After you’ve finished, press the EXIT

key to erase the menu.

ADJUST CHART SURFACE CLARITY

The markings extending downward from the zero line on the chart are

called “surface clutter.” These markings are caused by wave action, boat

wakes, temperature inversion, and other natural causes.

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Lowrance LMS-160 - GlobalMap 1600 Manual

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