Using Ais To Avoid Collisions - Raymarine a65 Operation Instructions Manual

12.11 Using AIS to avoid collisions

You can use the AIS safe zone and safety message
functions to help you avoid collisions with other
vessels and objects.
Safe Zones
A safe zone is a ring centred on your vessel within
which a target is considered dangerous. It is
displayed in the radar or chart applications as a red
ring.
This AIS safe zone uses the same criteria as MARPA
and will deem a target dangerous if it comes within
a specified distance of your vessel (closest point of
approach or CPA) within a specified time (time to
closest point of approach or TCPA). The CPA and
TCPA are calculated using COG/SOG and position
from the AIS target.
When your system recognizes a dangerous AIS
target:
• The target symbol changes to red and flashes.
• The dangerous alarm dialog is displayed (this can
be disabled if required).
• The dangerous alarm sounds (this can be disabled
if required).
Note: When the AIS unit is connected and
functioning, the system will check for dangerous
targets within the safe zone and if enabled issue
an alarm whenever necessary. Dangerous target
alarm operates irrespective of the status of the AIS
target display, or the safe zone ring.
Safety Messages
When the status of the AIS Safety Messages
function is set to On, any incoming safety messages
from surrounding vessels, shore stations and mobile
stations are displayed in a dialog box. If known, the
message will include the sending vessel's position in
latitude / longitude. You will have the option to:
• Remove the message (Ok).
• Place a waypoint on your chart / radar to mark the
sending vessel's position (Place Waypoint).
• Goto the sending vessel's position (Goto
Waypoint).
Note: You will NOT receive any safety messages
in Simulator mode (homescreen > Set-up >
System Settings > Simulator).
Showing the Safe Zone Ring in the Chart
application
To show the Safe Zone ring follow the instructions
below:
From the Chart application:
1. Select Menu.
2. Select Presentation.
3. Select Overlays.
4. Select Safe Zone Ring so that Show is selected.
Selecting Safe Zone Ring will switch the zone
ring between hidden to visible.
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Showing the Safe Zone Ring in the Radar
application
To show the Safe Zone ring follow the instructions
below:
From the Radar application:
1. Select Menu.
2. Select Presentation.
3. Select Safe Zone Ring so that Show is selected.
Selecting Safe Zone Ring will switch the zone
ring between hidden to visible.
Enabling and disabling AIS safety messages
in the Chart application
From in the Chart application:
1. Select Menu.
2. Select AIS Options or *Radar & AIS Options.
3. **Select Targets.
4. Select AIS Set-up.
5. Select Safety Messages.
Selecting Safety Messages will switch between
safety messages On and Off.
Note:
*When Radar overlay is also enabled the menu
name becomes Radar & AIS Options.
** Step 3 is only required when Radar overlay is
enabled.
Enabling and disabling AIS safety messages
in the radar application
From in the radar application:
1. Select Menu.
2. Select Targets.
3. Select AIS Set-up.
4. Select Safety Messages.
Selecting Safety Messages will switch between
safety messages On and Off.
Displaying safety-critical AIS information
From the chart or radar application:
1. Select the AIS target.
The AIS target context menu is displayed.
2. Select AIS Data so that On is highlighted.
Selecting AIS Data will switch between AIS data
On and Off.
The Safety critical AIS data will now be displayed
next to the target in the application.
LightHouse multifunction display operation instructions