What is the correct sequence of actions when a target becomes a high-risk risk of collision?

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In a high-risk collision situation you must base your response on verified information and a formal risk assessment, then take action guided by the rules and keep monitoring. Start by confirming the target data from radar/ARPA—verify range, bearing, speed, and course are current. Next, calculate the CPA (closest point of approach) and TCPA (time to CPA) to quantify how close and how soon the potential collision could be. Then decide the appropriate action in line with COLREGs, choosing a safe maneuver such as altering course, adjusting speed, or both. Execute that maneuver, and keep tracking the target, updating its trajectory and re-evaluating the risk as the situation evolves. If available, AIS can enhance the picture, but don’t rely on it alone or switch to AIS-only, since ARPA/radar tracking and continuous re-assessment are essential for safe resolution.