Chapter 17: Automatic Identification System (AIS) 269
Viewing full AIS data
To display detailed AIS data for an individual target e.g. static and dynamic and
voyage related data:
17.6Using AIS for collision avoidance
You can use your AIS for collision avoidance by using the safe zone and safety
message functions.
Safe zones
What is a safe zone?
The safe zone is a ring, centred on your boat. A target is considered dangerous if it is
predicted to, or will reach your safe zone within the set time period. 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 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.
• An alarm pop-up is displayed.
• An alarm sounds.
Disabling the dangerous target alarm
If required, the dangerous target alarm can be disabled. Once
disabled any dangerous targets that are detected, will turn red and
flash but the alarm will not sound and the pop-up will not be
displayed. The AIS status icon reflects that the alarm is disabled.
D8693_1
Move cursor over
required target
Select required target
on AIS list
VIEW FULL AIS
DATA...
Or
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81244_4.book Page 269 Thursday, January 31, 2008 1:53 PM
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