Confronted with the failures of flag states to adequately regulate their vessels, and/or to enforce applicable law, port states may assume a subsidiary regulatory and enforcement role. Exercising port state jurisdiction (PSJ) over foreign-flagged vessels, these port states may give effect to generally applicable international rules and standards, or simply apply their own laws. As the exercise of PSJ over foreign-flagged vessels often has effects outside the port, or even aims to regulate activities beyond national jurisdiction, legitimate questions as to the territorial nature of PSJ can be asked. It transpires, however, that most assertions of PSJ can formally be justified under a broad construction of the territoriality principle. Alternatively, they can find their basis in multilateral agreements or simply in the desire to protect common concerns. As the legality net regarding PSJ could thus be cast rather wide, the question, i.e., to what limitations such jurisdiction is subject, inevitably arises.

中文翻译：

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简介：港口国管辖权：挑战和潜力

面对船旗国未能充分监管其船舶和/或执行适用法律的情况，港口国可能承担辅助监管和执法的角色。对悬挂外国国旗的船舶行使港口国管辖权 (PSJ)，这些港口国可能会实施普遍适用的国际规则和标准，或仅适用自己的法律。由于对悬挂外国国旗的船舶行使 PSJ 通常会在港口外产生影响，甚至旨在规范国家管​​辖范围以外的活动，因此可以就 PSJ 的领土性质提出合理的问题。然而，事实证明，在领土原则的广泛构建下，PSJ 的大多数主张都可以被正式证明。或者，它们可以在多边协定中或仅仅在保护共同关切的愿望中找到它们的基础。由于有关 PSJ 的合法性网可能因此而变得相当广泛，因此不可避免地会出现问题，即此类管辖权受到哪些限制。