Practical Module for Visual Signals is 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 with 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 Methode of Signaling; (3) General Instructions; (4) Alphabetical flags, numeral pennants, and substitutes; (5) Flag Signaling; (6) Morse Code Alphabets and Numbers; (7) Flashing Light Signaling; (8) Phonetic Speeling of Letters and Numbers; (9) Radiotelephony Signaling; (10) Single Letter Code and Complement.

This module was provided in two version, Indonesia and English.