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This research-s aims to produce applied mathematics learning materials for nautical science grade III based on CO-PROL (Cooperative On Problem Based Learning) models which is valid, practicable and effective.This study was a research and development Branch (ADDIE) model which is consisted of 5 (five) steps, those are: (1) Analysis, (2) Design, (3) Development, (4)Implementation, and (5) Evaluation. The quality of learning resouce is determined based on Nieveen criteria, including validity, practicality, and effectiveness. The subject of this research were 36 cadets of Nautical Science Yogyakarta Maritime Academy. The research instrument included validation and observation sheets for learning implementation, questionnaires for lecturers and cadets, and the instrument of effectiveness of learning resouces. The data analysis technique is a quantitative descriptive technique.The result shows that the teaching materials are valid, practicable, and effective in terms of improving cadets- learning outcomes