Racons and their identifying marks are normally indicated on marine charts. Their purpose
can change with the country they are used in. Generally they are used to:
• Identify aids to navigation, both seaborne (buoys) and land-based (lighthouses)
• Identify landfall or positions on inconspicuous coastlines
• Indicate navigable spans under bridges
• Identify offshore oil platforms and similar structures
• Identify and warn of environmentally-sensitive areas (such as coral reefs)
In some countries they are also used to:
• Mark new and uncharted hazards (these should use the Morse identifier “D”)
• Identify center and turning points
• Leading line racons
Racons installed on buoys are usually active for 20 seconds, and then off for the next 20
seconds.
Recommended settings for racon detection
The racon response could be degraded by rain and sea anti-clutter control, and by
interference suppression. Turning off of the above mentioned settings should improve the
racon visibility on the PPI. The detection range of a racon may also be reduced if the radar
receiver is not tuned.
AIS targets
If a compatible AIS receiver is connected to the radar system, AIS targets can be displayed
and tracked.
The system can display and activate a preset number of AIS targets. Refer details in "Technical
specifications" on page 78. An alert is triggered if the number of AIS targets exceeds 95% of the
maximum system limitation and when the maximum capacity is reached. When the total AIS
capacity is reached, additional AIS targets will be visualized following a range based priority
logic. Only the target closest to the own vessel will be visualized.
The AIS function is available when:
• AIS data is available through the serial line
• Gyro compass heading is available. If gyro heading is lost the AIS function is automatically
switched OFF
• EPFS valid position is available
By default, all AIS targets are shown as sleeping targets if the AIS function is turned ON. You
can manually activate a sleeping target, or you can set up the system to automatically
activate sleeping targets as described in the next sections.
AIS targets can be filtered as described in "AIS target filters" on page 41.
Activating AIS targets
AIS targets are initially presented in sleeping status (A). A sleeping target does not show
vectors and heading lines, but only a small icon pointing in the direction of the target's
heading.
You can switch a sleeping target to an activated target (B). An activated AIS target shows a
larger icon, and it has an associated vector, heading line and a turning indicator if available.
Only activated AIS targets are listed in the target panel.
Activated AIS targets are always processed against CPA/TCPA limits, and are defined as
dangerous targets if the CPA/TCPA limits are exceeded.
Targets | R5000 Operator manual
39
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