ABSTRACT: This developmental research aimed to produce a supplemental learning material in Mathematics for Seamanship (Trim and Stability) using the ADDIE model. Mathematics concepts were determined through content analysis by examining the Seamanship Instructor’s Guide and class handouts and validated by two maritime teachers of JBLFMU-Arevalo. An outline of the lessons was drafted from the results of the content analysis. The supplemental learning material was then developed using the 4E Instructional model – Engage, Explore, Explain, and Evaluate. Furthermore, simple random sampling was used to select the 30 BSMT 2 students taking up Seamanship during the second semester of school year 2018-2019 as respondents. Meanwhile, a purposive sampling was used to determine 18 experts – 12 in Maritime Education and 6 in Mathematics. A researcher-made questionnaire that underwent validation and reliability testing was utilized to gather data. The statistical tools used were frequency, mean, and standard deviation. The results of the study showed that the mathematics concepts embedded in Seamanship lessons were: (1) Integers, (2) Fractions, (3) Decimals, (4) Percent, (5) Algebra, and (6) Trigonometry. It was also found that students have a “Very High” satisfaction towards the supplemental material when taken as a whole and in terms of physical aspects, objectives, learning activities, evaluation procedure, and usefulness. On the other hand, experts believed the supplemental learning material has a “Very High” acceptability when taken as a whole and in terms of physical aspects, objectives, and usefulness. However, experts found that it only has a “High” acceptability in terms of learning activities, and evaluation procedure. Thus, the supplemental learning material in Seamanship is appropriate, relevant, and useful in general and in terms physical aspects, objectives, learning activities, and evaluation procedure. It has also met the expectations and standards of chosen experts as reflected on their evaluation rating. Furthermore, the supplemental learning material may be subjected to the scrutiny of experts in the production of instructional materials and may be edited, if the expert suggests to do so. The university may use this supplemental learning material in improving students’ mastery of important mathematics lessons needed in Seamanship. Similarly, future researchers may conduct an experimental study to determine if the use of this supplemental learning material may improve students’ academic performance in Seamanship or another developmental research to produce similar supplemental learning materials for other maritime and general education subjects.

KEYWORDS: Maritime Education and Training (MET), Trim, Maritime Safety Education, Education of Navigators, Stability, College of Maritime Education (CME), Analysis, Design, Development, Implementation and Evaluation (ADDIE), Engage, Explore, Explain and Evaluation (4E)

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