Ship-to-ship communications, also known as VHF radio communications, is a form of communication used between two ships. It is typically used for navigation and safety purposes, such as exchanging information about weather conditions, navigational hazards, and other important information. The term 'AHOYS' is a common phrase used in ship-to-ship communications, which is an acronym for 'Are you on your station?' This phrase is used to confirm that the other vessel is ready to receive and respond to messages.