Garmin GPSMAP 8000 Manuel D’Utilisation

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.

• Pinch two fingers together to zoom out.
• Spread two fingers apart to zoom in.
• Drag the screen to pan, and then select   or   to zoom, if 

necessary.

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

Select Create Waypoint.

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.

From the sentry screen, select Menu > Radar Menu > 

Sentry Setup > Timed Transmit > On.

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

).

To help conserve power, you can indicate the radar standby 

time and the transmit time to implement periodic radar signal 

transmissions at set intervals.

From the sentry screen, select Menu > Radar Menu > 

Sentry Setup.

Select Stdby Time.

Enter the time interval between radar signal transmissions.

Select Transmit Time.

Enter the duration of each radar signal transmission.

From the sentry screen, select Menu > Radar Menu > 

Sentry Setup > Enable Guard Zone.

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

must enable a guard zone (

).

You can define a circular guard zone that completely 

encompasses your boat.

From the sentry screen, select Menu > Radar Menu > 

Sentry Setup > 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.

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

completely encompass your boat.

From the sentry screen, select Menu > Radar Menu > 

Sentry Setup > Adjust Guard Zone > Adjust 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.

Radar targeting enables you to identify and track objects.
Mini-automatic radar plotting aid (MARPA) 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.

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.

Before you can use MARPA, you must have a heading sensor 

connected and an active GPS signal. The heading sensor must 

provide the NMEA 2000 parameter group number (PGN) 

127250 or the NMEA® 0183 HDM or HDG output sentence.

From the Harbor, Offshore, or Cruising Radar screen, select 

an object or location.

Select Acquire Target > MARPA Target.

You can view the range, bearing, speed, and other information 

about a MARPA-tagged object.

From a radar screen, select a targeted object.

Select MARPA Target.

From the Radar screen, select a MARPA target.

Select MARPA Target > Remove.

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

customize the appearance of a list of AIS and MARPA threats.

Radar

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