This study investigates the implementation of Project-Based Concern (PBC) to develop an English for Maritime coursebook (EMC) model for maritime aligned with Seafarers STSDD certification requirements. Following Gall et al (2007)s model design, the research aims to create an interactive teaching material model suitable for a foundational English course tailored for seafarers. Twenty-five Seafarers and two experts were identified through questionnaires, interviews, and documentation, revealing ten thematic areas structured with twenty-seven subtopics. These thematic areas encompassed essential topics such as maritime communication, safety procedures, navigation, marine engineering, cargo operations, environmental awareness, cultural competence, legal aspects, health, and emergencies. Topics within these areas include theoretical knowledge, in-class exercises, and practical field assignments designed to enhance both individual and group learning experiences. These components were meticulously aligned with standards designed to enhance English language skills for maritime purposes among seafarers preparing for STSDD certification. The result of the EMC model, through PBC, tailored the guidelines to the unique contexts of maritime training. Effectiveness was assessed using the N-Gain Score, yielding a score of 0.86 (86.36%), indicating a significant improvement in language skills. The findings suggest that this PBC not only improves seafarers English for maritime language skills but also holds practical implications for onboard application. By incorporating PBC and specific materials, educators can optimize training programs to better equip seafarers for the linguistic demands of their roles and the requirements of STSDD certification exams.