What is the significance of the Stand-On vs Give-Way vessels in ARPA-guided avoidance?

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The idea being tested is how COLREGs priority between Stand-On and Give-Way vessels guides collision avoidance and how ARPA fits into the decision process. The Stand-On vessel should maintain its course and speed, while the Give-Way vessel must take early, substantial action to avoid a collision. ARPA helps by tracking targets, calculating metrics like closest point of approach and time to CPA, and plotting likely outcomes of different maneuvers. With this information, the operator can apply COLREGs rules and choose a safe action that reduces risk. ARPA doesn’t substitute human judgment; it provides the data and scenario outcomes to support a compliant, informed decision. In crossing situations the Give-Way vessel typically takes action, but the Stand-On vessel may still need to maneuver if risk remains or if the other vessel does not act appropriately. This combination—priority rules plus ARPA’s outcome simulations—lets you plan a safe, compliant avoidance.