Jeppesen Marine Workboat Navigator 1.3 - Manual (Page 120)

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Radar
Target Tab
Setup specifications for detected targets on the Targets Tab. Options and a brief
description are listed below.
Display ARPA Targets. Yes displays ARPA targets on the Chart window pane.
No turns off.
ARPA Targets Based On Magnetic. Choices for this option depend on the
type of heading sensor connected to your radar. For Magnetic heading sensors,
select Yes. For True North sensors, select No.
Display targets on radar display. Yes displays targets, No turns off target
display.
Display Predictors. This option will display a course predictor line in minutes for all
detected targets. Adjust the number of minutes. Check-mark turns on.
Display Wakes. Similar to a predictor line, the Display Wakes option allows you to
see a historical track of where the target has been. Adjust the number of minutes.
AIS/ARPA Target Timeouts. AIS and ARPA targets normally transmit reports every
few seconds. Select how long an AIS or ARPA target will remain on your screen
between reports. If the software does not receive a report during this set amount of
time, it will be removed from the display.
Target Threat Settings. Use this setup box to determine if you wish to detect
potential threats based on information received from ARPA targets. If a target meets
criteria for this setting, the target will render in a red color and a warning message
will be shown.
Detect Threats. Check this box to use the available settings in the Target Threat
Settings window.
Audible Alarm When Threat Detected. Check this box to receive an audible
alarm when CPA or TCPA meet safety zone criteria.
Closest Point of Approach (CPA) - Used to determine the safety zone area
around your boat - default is 0.58 statute miles. If a target enters into the area
specified by this setting, it is considered a threat.
Time until Closest Point of Approach (TCPA) - Sets a threshold amount
of time until the Closest Point of Approach. Default setting is 300 seconds (5
minutes).
Figure 12.2 - Target Threat Settings
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