Garmin GPSMAP 751 Manuale d'uso - Pagina 20

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• To show data from a 200 kHz sonar signal, select 200

kHz. This is useful mainly for more-shallow, inland waters.

• To show data from an 77 kHz sonar signal, select 77 kHz.

This is useful mainly for deeper waters and to see better

fish arches in shallow water..

• To select a specific frequency, select Add, and enter the

frequency.

Turning On the A-Scope

The a-scope is a vertical flasher along the right side of the full-

screen sonar view. This feature expands the most recently

received sonar data so that it is easier to see. It can also be

helpful for detecting fish that are close to the bottom.

From a Sonar view, select Menu > Sonar Setup >

Appearance > A-Scope.

Sonar Setup

Sonar Settings

From a Sonar view, select Menu > Sonar Setup.

Depth Line: Shows a quick-reference depth line.

Scroll Speed: Sets the rate at which the sonar scrolls from right

to left.

On-screen Control: Sets the control on the sonar screen to

control the gain or range. This is available for touchscreen

devices.

Appearance: See

page

14.

Overlay Numbers: See

page

Advanced: See

page

14.

Sonar Appearance Settings

From a Sonar view, select Menu > Sonar Setup >

Appearance.

Color Scheme: Sets the color scheme.

Whiteline: Highlights the strongest signal from the bottom to

help define the hardness or softness of the signal.

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

screen that shows instantaneously the range to targets along

a scale.

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.

Fish Symbols: Sets how the sonar interprets suspended

targets.

Advanced Sonar Settings

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

Interference: Adjusts the sensitivity to reduce the effects of

interference from nearby sources of noise.

Surface Noise: Hides surface noise to help reduce clutter.

Color Gain: Adjusts the color of sonar returns.

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.

Recording the Sonar Display

NOTE: Not all models support sonar recording.

Insert a memory card into the card slot.

From a Sonar view, select Menu > Record Sonar.

Stopping the Sonar Recording

Before you can stop recording the sonar, you must begin

recording it

(page

14).

From a sonar view, select Menu > Stop Recording.

Depth and Water Temperature Graphs

If you are using a depth-capable transducer, or are receiving

water depth information over NMEA 0183 or NMEA 2000, you

can view a graphic log of depth readings over time. If you are

using a temperature-capable transducer, or are receiving water

temperature information over NMEA 0183 or NMEA 2000, you

can view a graphic log of temperature readings over time.

The graphs scroll to the left as information is received.

Select Sonar > Data Graphs.

Setting the Depth and Water Temperature Graph

Range and Time Scales

You can indicate the amount of time and the range of depth that

appear in the depth and water temperature graphs.

Select Sonar > Data Graphs > Menu.

Select Depth Graph Settings or Temperature Graph

Settings.

Select an option:

• To set a time-elapsed scale, select Duration. The default

setting is 10 minutes. Increasing the time-elapsed scale

allows you to view variations over a longer period of time.

Decreasing the time-elapsed scale allows you to view

more detail over a shorter period of time.

• To set the depth-range or temperature-range scale, select

Scale. Increasing the scale allows you to view more

variation in readings. Decreasing the scale allows you to

view more detail in the variation.

The marine radar transmits microwave energy that has the

potential to be harmful to humans and animals. Before

beginning radar transmission, verify that the area around the

radar is clear. The radar transmits a beam approximately 12°

above and below a line extending horizontally from the center of

the radar. Avoid looking directly at the radar, because the eyes

are the most susceptible parts of the body.

NOTE: Not all models support radar.

When you connect your compatible chartplotter to an optional

Garmin marine radar, such as a GMR™ 1206 xHD or a GMR 24

HD, you can view more information about your surroundings.

The GMR transmits a narrow beam of microwave energy as it

rotates to a 360° pattern. When the transmitted energy contacts

a target, some of that energy is reflected back to the radar.

Radar

WARNING

Radar