Practical Module fpr Visual Signals in compiled based on the author's study to meet the requirements for Visual Signals Courses, in the Maritime Laboratory there should be a Practical Guide for the course. Therefore, the authors conducted the study through interviews, discussions eith the Captain/Officer, Lecturers of Nautical groups, Student Officers, cadets, and from the teaching experience at the Politeknik Ilmu pelayaran Semarang.

The materials in this Practical Module include: (1) general Explanations and Descriptions, (2) Definitions and Method of Signaling; (3) General Instructions; (4) Alphabetical flags, numeral pennants, and substitutes; (5) Flag Signaling; (6) Morse Code Alphabets and Numbers; (7) Flasing Light Signaling; (8) Phonetic Spelling of Letters and Numbers; (9) Radiotelephony Signaling; (10) SIngle Letter Code and Complement.

This Module was provided in two version, Indonesian and English.