What is required for a vessel replacement if three-fifths loaded according to Article 671?

Under Article 671, if a vessel is three-fifths loaded, the owner must always approve any replacement. This requirement ensures that the interests of the vessel owner are protected, as they have a vested interest in the condition and availability of the vessel being utilized for the charter. Replacement of a vessel at this stage could have significant implications regarding the charter agreement, liability, and operational efficiency. By necessitating the owner's approval, the charterer is discouraged from unilaterally deciding to replace the vessel without considering the contractual obligations and implications that a vessel change might entail. This further helps manage risk and maintain a clear line of authority and responsibility within the maritime commerce context.