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User Manual
ceived by AIS Receiver and displayed on the screen.
• CPA
Closest Point of Approach is the closest distance that will be achieved be-
tween your vessel and the tracked target, based on your vessel’s speed and
direction and the target’s speed and direction.
• CPA Limit
This is the distance from your vessel that a target may reach before a target is
deemed a threat.
• CPA Alarm
Occurs if CPA is less or equal to CPA Limit. This test is done for active
targets only.
• 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.
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