ARPA (Automatic Radar Plotting Aid) is one of the most important collision-avoidance tools on the bridge. By automatically acquiring and tracking radar targets, ARPA continuously calculates target course, speed, CPA (Closest Point of Approach), and TCPA (Time to CPA), giving navigators valuable information for making safe and timely decisions. It transforms raw radar echoes into actionable navigation data, significantly improving situational awareness in busy traffic areas and restricted visibility conditions.
Modern ARPA systems help bridge teams monitor multiple targets simultaneously, predict vessel movements, and identify potential collision risks before they become critical. When used correctly alongside COLREGs, visual lookout, AIS, and sound bridge watchkeeping practices, ARPA enhances navigational safety and contributes to efficient voyage planning and execution.
#ARPA #RadarNavigation #BridgeWatchkeeping #MaritimeSafety #MerchantNavy
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