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10.9 Using AIS to avoid collisions
You can use the AIS safe zone and safety message functions to
avoid collisions with other vessels and objects.
Safe Zones
A safe zone is a ring centred on your boat within which a target is
considered dangerous. It is displayed on radar or chart windows
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 specied distance of your
vessel (closest point of approach or CPA) within a specied 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 ashes.
• An alarm pop-up is displayed (this can be disabled if required).
• An alarm sounds (this can be disabled if required).
Note: When the AIS receiver 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 ON or OFF status of the AIS
target display, or the VISIBLE/HIDDEN status of the safe zone
ring.
Safety Messages
When the status of the AIS Safety Messages function is set to ON in
the Menu > AIS Layer Setup Menu, any incoming safety messages
from surrounding vessels, shore stations and mobile stations, are
displayed in a pop-up box. If known, the message will include the
sending vessel’s position in lat/lon. You now have the option to:
• Remove the message (ACKNOWLEDGE).
• Place a waypoint on your chart/radar to mark the sending vessel’s
position.
• Select to GOTO the sending vessel’s position.
Note: You will not receive any safety messages in Simulator
mode (Menu > System Setup > Simulator).
Displaying safety-critical AIS information
In the chart or radar application:
1. Move the cursor over the relevant AIS target.
2. Press the AIS DATA softkey until the ON option is highlighted.
3. Press the OK button.
140 C-Series Widescreen user reference