Bedienungsanleitung Garmin GPSMAP 820xs (Seite 27 von 46) (Englisch)

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Enabling a Guard Zone

From the sentry screen, select MENU

> Sentry Setup >

Enable Guard Zone

Defining a Circular Guard Zone

Before you can define the boundaries of the guard zone, you

must enable a guard zone (Enabling a Guard Zone).

You can define a circular guard zone that completely

encompasses your boat.

From the sentry screen, select MENU

> Sentry Setup >

Adjust Guard Zone > Move Radar Guard Zone > Circle

Select the location of the outer guard zone circle.

Select the location of the inner guard zone circle to define the

width of the guard zone.

Defining a Partial Guard Zone

You can define the boundaries of a guard zone that does not

completely encompass your boat.

From the sentry screen, select MENU > Sentry Setup >

Adjust Guard Zone >

Move Radar Guard Zone > Corner 1

Touch and drag the location of the outer guard-zone corner

Select

Corner 2.

Touch the location of the inner guard-zone corner

to define

the width of the guard zone.

Viewing a List of AIS Threats

From any Radar screen or the Radar overlay, you can view and

customize the appearance of a list of AIS threats.

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

Other Vessels > AIS List.

Showing AIS Vessels on the Radar Screen

AIS requires the use of an external AIS device and active

transponder signals from other vessels.

You can configure how other vessels appear on the Radar

screen. If any setting (except the AIS display range) is

configured for one radar mode, the setting is applied to every

other radar mode. The details and projected heading settings

configured for one radar mode are applied to every other radar

mode and to the Radar overlay.

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

Other Vessels > AIS Display Setup.

Select an option:

• To indicate the distance from your location within which

AIS vessels appear, select AIS Dis. Range, and select a

distance.

• 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

The VRM and the EBL configured for one mode are applied to

other radar modes.

NOTE: The VRM and the EBL cannot be changed in sentry

mode.

From a radar screen, select MENU

> 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).

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 Panning.

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).

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 the Radar overlay to overlay radar

information on the Navigation chart or on the Fishing chart.

The Radar overlay superimposes radar information on the

Navigation chart or the Fishing chart. Data appears on the

Radar overlay based on the most recently used radar mode

(such as Harbor, Offshore, or Sentry), and all settings

configurations applied to the Radar overlay are also applied to

the last-used radar mode. For example, if you use Harbor mode

and then you switch to the Radar overlay, the Radar overlay

would show Harbor mode radar data. If you changed the gain

setting using the Radar overlay menu, the gain setting for

Harbor mode would change automatically.

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

Radar 21

Garmin GPSMAP 820xs Seite 27

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