Operation Manual

99
User Manual
• Radio Call Sign
International call sign assigned to vessel, often used on voice radio.
• Name
Name of ship, 20 characters.
• MMSI
Maritime Mobile Service Identity.
• MMSI number
A unique 9 digit number that is assigned to a DSC radio station. It primarily registers
the boat information in the U.S. Coast Guard’s national distress database for use in
emergency situations.
• Active Target
Target located within the Activation Range. Active target is represented by oriented
triangle with COG and Heading vectors. Rate of turn may also be displayed.
• Dangerous Target
Target detected by CPA or TCPA Alarm. Dangerous target is Active Target by
definition. For better visibility Dangerous Target symbol is flashing.
• Sleeping Target
Target located outside the Activation Range. Sleeping target is represented by a
small oriented triangle.
• Lost Target
When the AIS info is not received from that vessel for 3.5 minutes. The presentation
will be a flashing black triangle with a cross through.
• Activation Range
Range around your boat where targets become active. AIS target become active
within this range. Activation Range should be greater than CPA Limit by definition.
Note
A target is removed from the screen if data is not received for 10 minutes.
The maximum number of tracked targets is 200.
Depending on the scale the presentation of the targets change to remove clutter on the screen.
This information is updated every 3 seconds to 6 minutes depending on speed and rate of turn, enabling the track
of the vessels in range to be plotted.
Fig. 5.7.1 - AIS Symbol Table