In maritime practice, it is common for a ship's master to temporarily halt navigation for a specific purpose, a situation known as "drifting." However, the legal status of a drifting vessel is not defined in the COLREGs, and there are conflicting opinions among scholars and case law regarding whether to apply general navigation rules or the ordinary practice of seaman. As a result, there is ambiguity regarding which vessel should maintain course and which should give way when they encounter each other. Furthermore, due to the lack of clarity in legal status, a drifting vessel is considered a power-driven vessel underway but not making way, making it difficult for other vessels to visually identify its status. Consequently, collisions involving drifting vessels continue to occur. To prevent such collisions, there is a need to eliminate this ambiguity. Meanwhile, the Automatic Identification System (AIS) provides real-time information on a vessel's position, course, speed, and navigational status. According to IMO Resolution.A.1106(29), AIS can display the vessel's current status. such as underway, at anchor, or restricted in maneuverability. Currently, the 13th slot in the AIS status list is reserved for future use. Therefore, it is proposed to assign this slot to indicate a "drifting vessel", allowing external parties to recognize the drifting status of a vessel.