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

1Select MENU.

2Select Frequency or FREQ.

3 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.

1Select MENU > Range.

2 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 or .

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.

1Select MENU > Zoom.

2Select Manual or Auto.

3Select Span and select or to increase or decrease the magnification of the magnified area.

4If 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.

1Select MENU > Setup > Sonar > Scroll.

2 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.

1Select MENU > Setup > Sonar > Fish ID.

2 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

1Select MENU > Gain > Manual.

2Select until you begin to see noise in the water portion of the screen.

3Select to decrease the gain slightly.

Setting the Gain Automatically

1Select MENU > Gain.

2 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.

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Sonar