Operation Manual

103
User Manual
• TCPA
Time to closest Point of Approach is the time remaining until the CPA will occur.
• TCPA Limit
This is the time remaining before the CPA is reached.
• TCPA Alarm
Occurs if TCPA is less or equal to TCPA Limit. This test is done for active
targets only and if CPA value is less or equal to CPA Limit.
• 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.