According to Article 670, what happens when a vessel is substituted?

When a vessel is substituted according to Article 670, the charterer is responsible for paying all transfer costs associated with the substitution. This reflects the principle that the charterer benefits from the substitution by gaining access to a different vessel that presumably fulfills the charter terms. As such, the financial responsibility for the transfer falls on the charterer, who initiated the change in vessel.

This aligns with the broader context of maritime law and contracts, where the party who seeks to change the terms of an agreement—such as the vessel being used—typically assumes the financial burden of that change. Ensuring clarity on these financial responsibilities is essential for maintaining the integrity of charter agreements and preventing disputes between parties involved.