Which legal concept allows for a vessel's conduct to be regulated based on its location?

The legal concept that allows for a vessel's conduct to be regulated based on its location is jurisdiction. Jurisdiction refers to the authority of a state or nation to govern or regulate activities within a certain area or under specific circumstances.

In maritime law, a vessel can be subject to the laws of the country whose waters it is in, as well as to the laws of the country whose flag it flies. For instance, when a vessel enters the territorial waters of a country, that country typically has the right to enforce its laws. This legal principle is essential for maintaining order, ensuring safety, and protecting the interests of both the state and the vessel.

Flag status pertains to the nationality of the vessel and dictates which country's laws primarily govern that vessel on the open seas, but does not directly address how location influences regulation. Substantive law involves the legal rules that govern rights and obligations but does not specifically define jurisdiction. Vessel type may influence regulations that apply to a specific category of vessels, but it is not the primary determinant for conduct based on location. Thus, jurisdiction is the correct concept in this context.