Garmin International Inc 02120D Manuel D’Utilisation

The radar zoom scale, also called the radar signal range,

represents the distance from your position (the center) to the

outermost ring.

From a Radar screen, select   or  .
Each ring represents an even division of the zoom scale.
For example, if the zoom scale is set at 3 miles, each ring

represents 1 mile from the center out.

The radar zoom scale, or radar signal range, indicates the

length of the pulsed signal transmitted and received by the

radar. As the range increases, the radar transmits longer

pulses in order to reach distant targets. Closer targets,

especially rain and waves, also reflect the longer pulses,

which can add noise to the Radar screen. Viewing

information about longer-range targets can also decrease the

amount of space available on the Radar screen for viewing

information about shorter-range targets.
• 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.

Sentry mode allows you to put the radar into timed-transmit

mode, in which you can configure a radar transmit and

standby cycle to conserve power. You can also enable a

guard zone in this mode, which identifies a safe zone around

your boat and sounds an alarm when a radar object enters

the zone. Sentry mode works with all Garmin GMR model

radars.

Select Radar > Sentry > Menu > Set Up Sentry >

Timed Xmit > On.

Before you can set the standby and transmit times, you must

enable timed transmit (page 17).
To help conserve power, you can indicate the radar standby

time and the transmit time to implement periodic radar signal

transmissions at set intervals.

Select Radar > Sentry > Menu > Set Up Sentry.

Select Stdby Time.

Enter the time interval between radar signal

transmissions.

Select Xmit Time.

Enter the duration of each radar signal transmission.

Select Radar > Sentry > Menu > Set Up Sentry >

Enable Guard Zone.

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

must enable a guard zone (page 17).
You can define a circular guard zone that completely

encompasses your boat.

Select Radar > Sentry > Menu > Set Up Sentry >

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.

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

completely encompass your boat.

Select Radar > Sentry > Menu > Set Up Sentry >

Adjust Guard Zone > Move Radar Guard Zone >

Corner 1.

Touch and drag the location of the outer guard-zone

corner 

À

.

Select Corner 2.

Touch the location of the inner guard-zone corner 

Á

 to

define the width of the guard zone.

From a Radar screen or the Radar overlay, select a

location.

Select Create Waypoint.

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.

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 Display 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 Projected Heading, and enter the

time.

Radar

17

DRAFT