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Nobeltec InSight Radar (IR2)
Operations Manual
Target Tracking Terms and Acronyms
Acronym Full Name Meaning
CPA
Closest Point of
Approach
CPA is the closest distance that can be achieved
between your vessel and the tracked target based
on your collective speed and direction.
TCPA
Time to Closest
Point of Approach
The time it takes to achieve the CPA. Time is
expressed in minutes.
Rng Target Range The targets range from your vessel.
Brg Target Bearing The bearing of the target in True or Magnetic.
CSE Target Course The tracked targets course.
SPD Target Speed The tracked targets speed.
Setting a Target Alarm
The alarm settings are set based on the targets CPA and/or TCPA. By default the
alarm settings are set to:
CPA: 1/2 nm
TCPA: 300 seconds.
When a predicted CPA of any target becomes smaller than the CPA alarm or its
predicted TCPA less than the TCPA alarm limit, an audio alarm sounds and the
target displays as a red triangle with a red vector.
To change the alarm settings go to the program options by clicking on the Options
toolbar button or through the menu system by clicking on the Tools drop down
menu and then on Options. Now click on the Targets tab and change the Target
Threat Criteria as desired. For more information on the Options, see the section
later in this chapter.
Warning: The CPA/TCPA alarm should never be relied upon as
the sole means for detecting the risk of collision. The navigator
is responsible for using all means of threat detection, including
visual observations.
Chapter 3
Working with IR2
