Internal communication on board a ship is divided into various sections, including communication between deck crew and engine crew, deck crew and kitchen crew, or internal communication among crew members within the same department. The diversity of these communication types can lead to work inefficiencies due to miscommunication among crew members, who may have different work systems. This issue becomes more complex when the crew members involved in communication come from two or more nations with different languages. This study has two research objectives. First, to explain the impact of implementing communication regulations on merchant ships on maritime safety. The second objective is to describe the implementation of communication use on board ships by maritime communication regulations. This study employs an explanatory research design, aiming to understand the relationship between exogenous and endogenous variables. In this research, hypotheses were tested using statistical analysis with the Partial Least Squares (PLS) approach, conducted using the Smart PLS software. The findings of this study indicate that the International Code of Signals (ICS) used on board ships is highly necessary, as vessels navigating international waters use different languages. Therefore, all crew members must have a thorough understanding of the International Code of Signals. Additionally, crew members need to maintain synergy in communication between ships and with the Vessel Traffic Service (VTS) while navigating shipping lanes. Furthermore, the ship reporting system within mandatory ship reporting significantly influences maritime safety, particularly in preventing ship collisions or other emergencies.
                        
                        
                        
                        
                            
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