What is the vessel that is required to take an early and substantial action to ensure avoiding a collision is called?

The vessel required to take early and substantial action to avoid a collision is called the "give-way vessel." This vessel must yield the right of way to another vessel, which is referred to as the "stand-on vessel." The give-way vessel must take appropriate measures, such as changing course or speed, to prevent a collision. This concept is fundamental in maritime navigation rules to ensure safety at sea.