Why should ARPA be self-tested regularly before operations?

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Regular self-testing before operations focuses on ensuring that the radar and ARPA are functioning correctly and that the system will perform reliably in traffic. ARPA is responsible for automatically tracking targets and calculating potential collision scenarios, so it must be able to process data accurately, generate valid tracks, and provide trustworthy CPA/TCPA warnings. A pre-flight self-test helps detect faults early—issues with target tracking, incorrect range or bearing data, or faulty input from heading and speed sensors can all lead to misleading plots if left unchecked. By confirming proper operation and catching faults before you enter busy waters, you reduce the risk of wrong decisions in conjunction with other vessels and improve overall navigation safety. While routine checks and training have their place, the comprehensive goal of self-testing is to verify functionality, catch faults early, and ensure reliable performance when it matters most in traffic.