Bedienungsanleitung Garmin GPSMAP 7400 series (Seite 35 von 62) (Englisch)

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• To show details about AIS-activated vessels, select

Details

> Show

• To set the projected heading time for AIS-activated

vessels, select Proj. Heading, and enter the time.

• To show the tracks of AIS vessels, select Trails, and

select the length of the track that appears.

VRM and EBL

The variable range marker (VRM) and the electronic bearing line

(EBL) measure the distance and bearing from your boat to a

target object. On the Radar screen, the VRM appears as a circle

that is centered on the present location of your boat, and the

EBL appears as a line that begins at the present location of your

boat and intersects the VRM. The point of intersection is the

target of the VRM and the EBL.

Showing the VRM and the EBL

From a radar screen, select Menu > Radar Options > Show

VRM/EBL.

Adjusting the VRM and the EBL

Before you can adjust the VRM and the EBL, you must show

them on the Radar screen (Showing the VRM and the EBL,

page 27).

You can adjust the diameter of the VRM and the angle of the

EBL, which moves the intersection point of the VRM and the

EBL. The VRM and the EBL configured for one mode are

applied to all other radar modes.

From a Radar screen, select a new location for the

intersection point of the VRM and the EBL.

Select Drop VRM/EBL.

Select

Stop Pointing.

Measuring the Range and Bearing to a Target Object

Before you can adjust the VRM and the EBL, you must show

them on the Radar screen (Showing the VRM and the EBL,

page 27).

From a Radar screen, select the target location.

Select

Measure Distance.

The range and the bearing to the target location appear in the

upper-left corner of the screen.

Radar Overlay

When you connect your chartplotter to an optional Garmin

marine radar, you can use overlay radar information on the

Navigation chart or on the Fishing chart.

Data appears on the radar overlay based on the most recently

used radar mode and all settings configurations applied to the

radar overlay are also applied to the last-used radar mode.

Radar Overlay and Chart Data Alignment

When using the Radar overlay, the chartplotter aligns radar data

with chart data based on the boat heading, which is based by

default on data from a magnetic heading sensor connected

using a

NMEA 0183 or NMEA 2000 network. If a heading sensor

is not available, the boat heading is based on GPS tracking

data.

GPS tracking data indicates the direction in which the boat is

moving, not the direction in which the boat is pointing. If the boat

is drifting backward or sideways due to a current or wind, the

Radar overlay may not perfectly align with the chart data. This

situation should be avoided by using boat-heading data from an

electronic compass.

If the boat heading is based on data from a magnetic heading

sensor or an automatic pilot, the heading data could be

compromised due to incorrect setup, mechanical malfunction,

magnetic interference, or other factors. If the heading data is

compromised, the Radar overlay may not align perfectly with the

chart data.

Echo Trails

The echo trails feature enables you to track the movement of

vessels on the radar display. You can change the length of time

the trail is displayed.

NOTE:

Depending upon the radar in use, the settings configured

for use in one radar mode may or may not be applied to other

radar modes or to the radar overlay.

NOTE: Not all options and settings are available on all radar and

chartplotter models.

Turning on Echo Trails

From a radar screen, select Menu

> Radar Options > Echo

Trails > Display

Adjusting the Length of the Echo Trails

From a radar screen or the radar overlay, select Menu >

Radar Options > Echo Trails

> Time

Select the length of the trail.

Clearing the Echo Trails

You can remove the echo trails from the radar screen to reduce

the clutter on the screen.

From a radar screen, select Menu > Radar Options >

Echo

Trails > Clear Trails

Optimizing the Radar Display

You can adjust the radar display settings for reduced clutter and

increased accuracy.

NOTE:

You can optimize the radar display for each radar mode.

Select a radar range (Adjusting the Radar Range, page 25).

Restore the default value of the gain setting (Adjusting Gain

on the Radar Screen Automatically,

page

27).

Adjust the gain setting manually (Adjusting Gain on the

Radar Screen Manually,

page

27).

Radar Gain and Clutter

Adjusting Gain on the Radar Screen Automatically

The automatic gain setting for each radar mode is optimized for

that mode, and may differ from the automatic gain setting used

for another mode.

NOTE: Depending upon the radar in use, the gain setting

configured for use in one radar mode may or may not be applied

to other radar modes or to the Radar overlay.

NOTE: Not all options and settings are available on all radar and

chartplotter models.

From a radar screen or the radar overlay, select Menu

Gain

Select an option:

• To adjust the gain automatically for changing conditions,

select

Auto Low or Auto High.

• To adjust the gain automatically to show birds over the

surface of the water, select Auto Bird

Adjusting Gain on the Radar Screen Manually

For optimal radar performance, you can manually adjust the

gain.

NOTE: Depending upon the radar in use, the gain setting

configured for use in one radar mode may or may not be applied

to other radar modes or to the Radar overlay.

From a Radar screen or the Radar overlay, select Menu >

Gain.

Select

Up to raise the gain, until light speckles appear across

the Radar screen.

Data on the Radar screen is refreshed every few seconds. As

a result, the effects of manually adjusting the gain may not

appear instantly. Adjust the gain slowly.

Radar 27

Garmin GPSMAP 7400 series Seite 35

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