Bedienungsanleitung Garmin GPSMAP 1222 (Seite 33 von 60) (Englisch)

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decrease the amount of space available on the radar screen for

viewing information about shorter-range targets.

From a radar screen, press the knob.

If necessary, select

FOCUS to select a radar view.

Turn the knob to increase or decrease the range.

Tips for Selecting a Radar Range

• Determine what information you need to see on the Radar

screen.

For example, do you need information about nearby weather

conditions or targets and traffic, or are you more concerned

about distant weather conditions?

• Assess the environmental conditions where the radar is being

used.

Especially in inclement weather, longer-range radar signals

can increase the clutter on the Radar screen and make it

more difficult to view information about shorter-range targets.

In rain, shorter-range radar signals can enable you to view

information about nearby objects more effectively, if the rain

clutter setting is configured optimally.

• Select the shortest effective range, given your reason for

using radar and the present environmental conditions.

Marking a Waypoint on the Radar Screen

From a Radar screen or the Radar overlay, select a location.

Select

New Waypoint.

MotionScope

™

Doppler Radar Technology

The

GMR Fantom radar uses the Doppler effect to detect and

highlight moving targets to help you avoid potential collisions,

find flocks of birds, and track weather formations. The Doppler

effect is the frequency shift in the radar echo due to the relative

motion of the target. This allows for instant detection of any

targets moving toward or away from the radar.

The MotionScope feature highlights the moving targets on the

radar display so you can navigate around other boats or severe

weather, or toward fishing spots where birds are feeding at the

surface.

The moving targets are color-coded so you can tell at a glance

which targets are heading your way and which are heading

away from you. On most color schemes, green indicates the

target is moving away from you and red indicates the target is

moving toward you.

Enabling a Guard Zone

You can enable a guard zone to alert you when anything comes

within a specified area around your boat.

NOTE:

This feature is not available in dual radar modes.

From a radar screen, select MENU

> Radar Options >

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, page 25).

You can define a circular guard zone that completely surrounds

your boat.

From a radar screen, select MENU > Radar Options

Adjust Guard Zone > Adjust 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

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

must enable a guard zone (Enabling a Guard Zone,

page

25)

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

completely surround your boat.

From the sentry screen, select MENU

> Radar Options >

Adjust Guard Zone > Adjust Guard Zone > Corner 1

Use the arrow keys to select the location of the outer guard-

zone corner

Select

Corner 2.

Select the location of the inner guard-zone corner

to define

the width of the guard zone.

Select

Done.

Disabling a Guard Zone

You can disable a guard zone.

From a radar screen, select MENU

> Radar Options >

Adjust Guard Zone > Disable Guard Zone

The guard zone configuration is saved, so you can enable it

again when needed.

MARPA

Mini-automatic radar plotting aid (MARPA) enables you to

identify and track targets and is primarily used for collision

avoidance. To use MARPA, you assign a MARPA tag to a

target. The radar system automatically tracks the tagged object

and provides you with information about the object, including the

range, bearing, speed, GPS heading, nearest approach, and

time to nearest approach. MARPA indicates the status of each

tagged object (acquiring, lost, tracking, or dangerous), and the

chartplotter can sound a collision alarm if the object enters your

safe zone.

MARPA Targeting Symbols

Acquiring a target. Concentric, dashed green rings radiate from

the target while the radar is locking onto it.

Target has been acquired. A solid green ring indicates the

location of a target that the radar has locked onto. A dashed

green line attached to the circle indicates the projected course

over ground or the GPS heading of the target.

Dangerous target is in range. A red ring flashes from the target

while an alarm sounds and a message banner appears. After

the alarm has been acknowledged, a solid red dot with a dashed

red line attached to it indicates the location and the projected

course over ground or the GPS heading of the target. If the safe-

zone collision alarm has been set to Off, the target flashes, but

the audible alarm does not sound and the alarm banner does

not appear.

Target has been lost. A solid green ring with an X through it

indicates that the radar could not lock onto the target.

Closest point of approach and time to closest point of approach

to a dangerous target.

Radar 25

Garmin GPSMAP 1222 Seite 33

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