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Turn on MARPA Alarms
For a MARPA target to be detected, the radar must be transmitting and a return must be identified as a target. The settings in this
section are shared with Radar.
1. Press the HOME key.
2. Select Alarms.
3. Select Alarms > Targets.
4. Under Radar, select an alarm and turn it on. (Tap the on/off button, or press the ENTER key, to turn it on.)
Set the Safe Zone
Use the Safe Zone to set how close targets may approach your vessel. If a target crosses into the Safe Zone, its status will change
to Dangerous. You can set the size of the safe zone around the vessel in nautical miles or time. To display the Safe Zone on the Radar
View or Chart View, see Display the Safe Zone.
1. Press the HOME key.
2. Select the Targets tool.
3. Select Settings > Safe Zone (Range) or Safe Zone (Time).
Safe Zone (Range): Select the closest point of approach by another vessel (based on CPA [Closest Point of Approach] and
TCPA [Time to Closest Point of Approach]). The amount is estimated in nautical miles, and the value determines the safe zone
radius.
Safe Zone (Time): Select the closest point of approach, measured in time.
Dangerous Target
Turn on Dangerous Target to receive an alert if a MARPA target tracked as dangerous is
detected in the radar transmission range.
Lost Target
Turn on Lost Target to receive an alert if a tracked MARPA target has changed to lost in the
radar transmission range. A target may be lost if its signal has not been received in the last
30 seconds.
Guard Zone
(Sector)
Turn on Guard Zone (Sector) to receive an alert when a radar return or MARPA target enters
the guard zone sector. See Radar Alarms to set the Guard Zone.
Guard Zone
(Circle)
Turn on Guard Zone (Circle) to receive an alert when a radar return or MARPA target enters the
guard zone circle. See Radar Alarms to set the Guard Zone.
AIS & MARPA
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