Target Tracking - Lighthouse Raymarine gS95 Installation And Operation Instruction Manual

21.6 Target tracking

The Guard Zone , VRM/EBL and MARPA functions
will help you track targets and avoid collisions.
With a radar connected to your multifunction display,
you can:
• Assess how far away a target is and its bearing
(VRM/EBL).
• Set an alarm to trigger when a target is within a
specified zone (Guard Zone).
• Display detailed information on tracked targets
(MARPA).
• Display the range and bearing of a target.
Setting up a radar guard zone
From the radar application:
1. Select Menu.
2. Select Zones.
3. Select Guard Zone so that On is highlighted.
Selecting Guard Zone will switch the zone On
and Off.
4. Select Guard Zone Set-up.
5. Select Shape: to switch between Sector or
Circle.
6. Select Outer: .
The Outer numeric adjust control is displayed.
7. Adjust the outer edge of the guard zone to the
required distance.
8. Select Ok to close the numeric adjust control.
9. Select Inner: .
The Inner numeric adjust control is displayed.
10. Adjust the inner edge of the guard zone to the
required distance.
11. Select Ok to close the numeric adjust control.
12. Select Width: .
The Width numeric adjust control is displayed.
13. Adjust the width of the guard zone in degrees.
14. Select Ok to close the numeric adjust control.
15. Select Bearing: .
The Bearing numeric adjust control is displayed.
16. Adjust the bearing of the guard zone in degrees
port or degrees starboard.
17. Select Ok to close the numeric adjust control.
Note: Guard zone width and bearing can only be
adjusted when the Shape: is set to Sector.
Guard zone context menu
The guard zone function includes a context menu
which provides additional menu items.
Radar application
The context menu provides the following menu items:
• Acquire Target.
• Adjust Zone
• Zone Off
Accessing the context menu
1. Non-touchscreen and HybridTouch displays:
i. Move the cursor over the area or object and
pressing the Ok button.
2. HybridTouch and Touch only displays:
i. Select and hold on an area or object, or
ii. With the Chart Call-out displayed select the
Call-out box.
Adjusting guard zone sensitivity
You can adjust the threshold at which the alarm is
triggered by a target entering the guard zone.
From the Radar application menu:
1. Select Zones.
2. Select Sensitivity.
The sensitivity numeric adjust control is displayed.
3. Adjust the sensitivity to the required value.
4. Select Ok or Back to confirm setting and close
the numeric adjust control.
MARPA overview
MARPA is used for target tracking and risk analysis
in the radar application.
With an accurate heading sensor connected to
your multifunction display, you can use the Mini
Automatic Radar Plotting Aid (MARPA) functions for
target tracking and risk analysis. MARPA improves
collision avoidance by calculating information for
tracked targets, and provides continuous, accurate,
and rapid situation evaluation. The number of targets
that you can track at any one time is dependent on
the model of radar scanner that you are using.
MARPA tracks acquired targets, and calculates the
target's speed and course.
Each target tracked can be displayed with a graphic
indicating the Closest Point of Approach (CPA), and
Time to Closest Point of Approach (TCPA). The
calculated target data can also be shown on your
screen. Each target is continually assessed and
an audible alarm is sounded if a target becomes
dangerous, or is lost.
For effective MARPA operation, your multifunction
display must have accurate heading and speed data
for your vessel. The better the quality of the heading
and speed data, the better MARPA will perform. For
the best heading data, a Raymarine SMART heading
sensor or a gyro-stabilized autopilot is required.
In True Motion mode, Speed Over Ground (SOG)
and Course Over Ground (COG) information is
required to show true target course and speed.
In Relative Motion mode, heading and speed
information is required.
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