Using Radar To Track Targets And Avoid Collisions - Raymarine a67 Wi-Fi Installation And Operation Instructions Manual

16.13 Using radar to track targets and
avoid collisions
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 Track Targets.
3. Select Guard Zone Set-up.
4. Select Zone so that On is highlighted.
Selecting Zone will switch the zone On and Off.
5. Select Adjust Zone.
6. Select Shape: to switch between Sector or Circle.
7. Select Outer: .
The Outer numeric adjust control is displayed.
8. Adjust the outer edge of the guard zone to the required
distance.
9. Select Ok to close the numeric adjust control.
10. Select Inner: .
The Inner numeric adjust control is displayed.
11. Adjust the inner edge of the guard zone to the required
distance.
12. Select Ok to close the numeric adjust control.
13. Select Width: .
The Width numeric adjust control is displayed.
14. Adjust the width of the guard zone in degrees.
15. Select Ok to close the numeric adjust control.
16. Select Bearing: .
The Bearing numeric adjust control is displayed.
17. Adjust the bearing of the guard zone in degrees port or
degrees starboard.
18. 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.
The context menu provides the following menu items:
• Acquire Target.
• Adjust Zone
• Zone Off
Accessing the context menu
You can access the context menu by following the steps below.
1. New e Series or New c Series:
i. Selecting a location, object or target on-screen and
pressing the Ok button.
2. Touchscreen multifunction displays:
i. Selecting an object or target on-screen.
ii. Selecting and holding on a location on-screen.
Radar application
Adjusting guard zone sensitivity
You can adjust the threshold at which the alarm is triggered by a
target entering the guard zone.
1. Select Menu.
2. Select Track Targets.
3. Select Guard Zone Set-up.
4. Select Sensitivity.
The sensitivity numeric adjust control is displayed.
5. Adjust the sensitivity to the required value.
6. Select Ok to confirm setting and close the numeric adjust
control.
The guard zone sensitivity setting can also be accessed from
the Alarms menu: homescreen > Set-up > Alarms > Guard
Zone > Sensitivity.
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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Item
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Safety notices
MARPA can improve collision avoidance when used wisely.
It is your responsibility to exercise common prudence and
navigational judgement.
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D12219-1
Description
Safe target
Lost target
Dangerous target
Target being acquired
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