Garmin echo 151 Owner's Manual - Page 6

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NOTE: To receive DownVü scanning sonar, you need a

compatible chartplotter or fishfinder and a compatible

transducer.

DownVü high-frequency sonar provides a clearer picture below

the boat, providing a more detailed representation of structures

the boat is passing over.

Traditional transducers emit a conical beam. The DownVü

scanning sonar technology emits a narrow beam, similar to the

shape of the beam in a copying machine. This beam provides a

clearer, picture-like image of what is beneath the boat.

Sonar Frequencies

NOTE: The frequencies available depend on the transducer

being used.

Adjusting the frequency helps adapt the sonar for your particular

goals and the present depth of the water.

Higher frequencies use narrow beam widths, and are better for

high-speed operation and rough sea conditions. Bottom

definition and thermocline definition can be better when using a

higher frequency.

Lower frequencies use wider beam widths, which cover a larger

area and can let the fisherman see more targets, but could also

generate more surface noise and reduce bottom signal

continuity during rough sea conditions. Wider beam widths

generate larger arches for fish target returns, making them ideal

for locating fish. Wider beam widths also perform better in deep

water, because the lower frequency has better deep water

penetration. They can be used to search for structures such as

brush piles.

Selecting a Frequency

Select MENU.

Select Frequency or FREQ.

Select a frequency.

Adjusting the Range of the Depth Scale

You can adjust the range of the depth scale that appears on the

right side of the screen. Automatic ranging keeps the bottom

within the lower third of the sonar screen, and can be useful for

tracking the bottom where there are slow or moderate terrain

changes.

When the depth changes dramatically, like a drop off or cliff,

manually adjusting the range allows a view of a specified depth

range. The bottom is shown on the screen as long as the

bottom is anywhere within the manual range established.

Select MENU > Range.

Select an option.

• To allow the device to adjust the range automatically

based on the depth, select Auto.

• To increase or decrease the range manually, select

Manual, and select

NOTE: Setting the range on one page applies that setting to

all pages.

Adjusting the Zoom

You can adjust the zoom manually by specifying the span and a

fixed starting depth. For example, when the depth is 15 meters

and a starting depth of 5 meters, the device displays a

magnified area from 5 meters deep to 20 meters deep.

You also can allow the device to adjust the zoom automatically

by specifying a span. The device calculates the zoom area from

the bottom of the water. For example, if you select a span of 10

meters, the device displays an magnified area from the bottom

of the water to 10 meters above the bottom.

Select MENU > Zoom.

Select Manual or Auto.

Select Span and select

magnification of the magnified area.

If necessary, select Depth to adjust the zoomed window up

or down.

NOTE: The zoomed window tracks the bottom in auto mode

only.

Pausing the Sonar Screen

Select MENU > Pause.

Setting the Sonar Scroll Speed

You can set the rate at which the sonar scrolls from right to left.

A higher scroll speed shows more detail, especially while

moving or trolling. A lower scroll speed displays sonar

information on the screen longer.

Select MENU > Setup > Sonar > Scroll.

Select a scroll speed.

NOTE: Setting the scroll speed on one page applies that

setting to all the pages.

Configuring the Appearance of Suspended

Targets

NOTE: Configuring the appearance of suspended targets on

one page applies that setting to all pages.

NOTE: This feature is not available on all transducers.

Shows suspended targets as symbols.

Shows suspended targets as symbols with target depth

information.

Shows suspended targets as symbols with background sonar

information.

Shows suspended targets as symbols with background sonar

information and target depth information.

Select MENU > Setup > Sonar > Fish ID.

Select an option.

Sonar Gain and Noise Settings

You can adjust the amount of gain and noise on a sonar screen.

The gain setting controls the sensitivity of the sonar receiver to

compensate for water depth and water clarity. Increasing the

gain shows more detail, and decreasing the gain reduces

screen clutter.

NOTE: Setting the gain on one page applies the setting to all

the pages.

Setting the Gain Manually

Select MENU > Gain > Manual.

Select

until you begin to see noise in the water portion of

the screen.

Select

to decrease the gain slightly.

Setting the Gain Automatically

Select MENU > Gain.

Select an option:

• To display higher-sensitivity, weaker sonar returns with

more noise automatically, select Auto-High.

• To display medium-sensitivity sonar returns with

moderate noise automatically, select Auto-Med.

• To display lower-sensitivity sonar returns with less noise

automatically, select Auto-Low.

Alarms

Select MENU > Setup > Alarms.

to increase or decrease the

Sonar