Bedienungsanleitung Garmin GPSMAP 8417 MFD (Seite 31 von 62) (Englisch)

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Bottom Fill: Colors the bottom brown to distinguish it from the

water returns.

Trails: Sets the how long the trails appear on the screen. The

trails show the movement of the target.

Grid Overlay: Shows a grid of range lines.

Noise Reject: Reduces the interference and the amount of

clutter shown on the sonar screen.

Scroll History: Shows the sonar history in a traditional sonar

view.

Overlay Data: Sets the data shown on the sonar screen

(Customizing the Data Overlays, page 3).

Installation: Configures the transducer (Calibrating the

Compass,

page

20)

Sonar Noise Rejection Settings

From a sonar view, select Menu >

Sonar Setup > Noise

Reject

Interference: Adjusts the sensitivity to reduce the effects of

interference from nearby sources of noise.

The lowest interference setting that achieves the desired

improvement should be used to remove interference from the

screen. Correcting installation issues that cause noise is the

best way to eliminate interference.

Color Limit: Hides part of the color palette to help eliminate

fields of weak clutter.

By setting the color limit to the color of the undesired returns,

you can eliminate the display of undesired returns on the

screen.

Smoothing: Removes noise that is not part of a normal sonar

return, and adjusts the appearance of returns, such as the

bottom.

When smoothing is set to high, more of the low-level noise

remains than when using the interference control, but the

noise is more subdued because of averaging. Smoothing can

remove speckle from the bottom. Smoothing and interference

work well together to eliminate low-level noise. You can

adjust the interference and smoothing settings incrementally

to remove undesirable noise from the display.

Surface Noise: Hides surface noise to help reduce clutter.

Wider beam widths (lower frequencies) can show more

targets, but can generate more surface noise.

TVG: Adjusts the time varying gain, which can reduce noise.

This control is best used for situations when you want to

control and suppress clutter or noise near the water surface.

It also allows for the display of targets near the surface that

are otherwise hidden or masked by surface noise.

Sonar Appearance Settings

From a sonar view, select Menu > Sonar Setup > Appearance.

Color: Sets the color scheme and color gain.

Overlay Data: Sets the data shown on the sonar screen.

A-Scope: Displays a vertical flasher along the right side of the

screen that shows instantaneously the range to targets along

a scale.

Depth Line: Shows a quick-reference depth line.

Edge: Highlights the strongest signal from the bottom to help

define the hardness or softness of the signal.

Pic. Advance: Allows the sonar picture to advance faster by

drawing more than one column of data on the screen for

each column of sounder data received. This is especially

helpful when you are using the sounder in deep water,

because the sonar signal takes longer to travel to the water

bottom and back to the transducer.

The 1/1 setting draws one column of information on the

screen per sounder return. The 2/1 setting draws two

columns of information on the screen per sounder return, and

so on for the 4/1 and 8/1 settings.

Sonar Alarm Settings

NOTE: Some settings require external accessories.

Select Settings

> Alarms > Sonar

Shallow Water: Sets an alarm to sound when the depth is less

than the specified value.

Deep Water: Sets an alarm to sound when the depth is greater

than the specified value.

Water Temp.: Sets an alarm to sound when the transducer

reports a temperature that is 2°F (1.1°C) above or below the

specified temperature.

Contour: Sets an alarm to sound when the transducer detects a

suspended target within the specified depth from the surface

of the water and from the bottom.

Fish: Sets an alarm to sound when the device detects a

suspended target.

• sets the alarm to sound when fish of all sizes are

detected.

• sets the alarm to sound only when medium or large

fish are detected.

• sets the alarm to sound only when large fish are

detected.

Advanced Sonar Settings

From a sonar view, select Menu > Sonar Setup > Advanced.

Transmit: Stops the transducer from transmitting.

Shift: Allows you to set the depth range on which the sonar is

focused. This allows you to zoom in a higher resolution in the

focused depth.

When using shift, bottom tracking may not work effectively,

because the sonar looks for data within the depth range of

the focused area, which may not include the bottom. Using

shift also can impact the scroll speed, because data outside

the depth range of the focused area is not processed, which

reduces the time required to receive and display the data.

You can zoom in to the focused area, which enables you to

evaluate target returns more closely at a higher resolution

than just zooming alone.

Echo Stretch: Adjusts the size of the echoes on the screen to

make it easier to see separate returns on the screen.

When targets are difficult to see, echo stretch makes the

target returns more pronounced and easier to see on the

screen. If the echo stretch value is too high, the targets blend

together, and if the value is too low, the targets might be

small and difficult to see.

You can use echo stretch and filter width together to obtain

the preferable resolution and noise reduction. With echo

stretch and filter width set to low, the display has the highest

resolution, but is the most susceptible to noise. With echo

stretch set to high and filter width set to low, the display has a

lower resolution, but has wider targets. With echo stretch and

filter width set to high, the display has the lowest resolution,

but is the least susceptible to noise. It is not recommended to

set echo stretch to low and filter width to high.

Bottom Track: Sets the frequency used for determining depth.

The bottom tracking control allows you to select the specific

channel that is used to track the bottom. For example, you

can set the bottom tracking for the low frequency for deep

water operation.

Temp. Source: Sets the channel for the water temperature log

when more than one water-temperature sensor or

temperature-capable transducer is connected.

Transducer Installation Settings

From a sonar view, select Menu > Sonar Setup > Installation.

Sonar 23

Garmin GPSMAP 8417 MFD Seite 31

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