Bedienungsanleitung Garmin GPSMAP 557 (Seite 28 von 48) (Englisch)

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• 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

compromised, the Radar overlay may not align perfectly with the

chart data.

Showing the Radar Overlay

The radar overlay displays data based on the most recently

used radar mode.

Select Charts > Radar Overlay.

The radar picture appears in orange and overlays the

navigation chart.

Setting a Custom Park Position

If you have more than one radar on your boat, you must be

viewing the radar screen for the radar you want to adjust.

By default, the antenna is stopped perpendicular to the pedestal

when it is not spinning. You can adjust this position.

From the radar screen, select Menu > Radar Setup >

Antenna Configuration > Park Position.

Use the slider bar to adjust the position of the antenna when

stopped, and select Back.

Enabling and Adjusting a Radar No Transmit

Zone

You can indicate an area within which the radar scanner does

not transmit signals.

NOTE: This feature is not available on all radar and chartplotter

models.

From a radar screen, select Menu > Radar Setup > Enable

No Transmit Zone.

The no-transmit zone is indicated by a shaded area on the

radar screen.

Select Adjust No Transmit Zone > Move No Transmit

Zone.

Select Angle 1, and select the new location for the first

angle.

Select Angle 2, and select the new location for the second

angle.

Select Done.

Stopping the Transmission of Radar Signals

From a radar screen, select Menu > Radar to Standby.

TIP: Press from any screen to quickly stop radar

transmission.

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).

Restore the default value of the gain setting (Adjusting Gain

on the Radar Screen Automatically).

Adjust the gain setting manually (Adjusting Gain on the

Radar Screen Manually).

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.

22 Radar

Garmin GPSMAP 557 Seite 28

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