The simplified Automatic Radar Plotting Aid (ARPA) function aids in collision avoidance with other vessels or objects. Up to five targets can be automatically tracked on the radar echo, with up to ten targets trackable when manually set. Selecting a target displays its position, course, speed, Closest Point of Approach (CPA), Time to CPA (TCPA), bearing, and distance on the display's lower side. When a target breaches the CPA and TCPA limits, an alarm message and beep alert are triggered.