According to maritime rules, which vessel is considered a stand-on vessel in a crossing situation?

In a crossing situation, the term "stand-on vessel" refers to the vessel that is required to maintain its course and speed in the presence of another vessel. This implies that the stand-on vessel is receiving the right of way in the encounter and will continue to navigate forward without making a significant alteration to its course or speed.

The rationale behind this designation is grounded in the COLREGs, specifically Rule 15, which indicates that when two power-driven vessels are approaching each other, the one that does not have the obligation to alter its course must be prepared to take evasive action if the give-way vessel does not change its course as necessary to avoid a collision. Hence, the stand-on vessel is expected to keep its path as the other vessel— the give-way vessel—makes its changes to avoid a collision.

By adhering to these protocols, maritime navigation is made safer and more predictable, as each vessel's intentions and actions are guided by established rules.