ColRegs: Navigation Lights & Shapes is a comprehensive educational and reference app developed for seafarers. This app is designed to help sailors, boaters, and fishermen to identify vessels and their activities as specified by the ColRegs. It is a quick learning and revision tool that contains over 100 graphics and covers the International Regulations for Preventing Collisions at Sea. This app is an offline tool, so no internet connection is required. It is easy to use and navigate with every rule and definition available at the touch of a finger. The app has four sections that cover the Nav Lights, Day Shapes, Test Yourself, and the ColRegs rules in full.

The Nav Lights section features graphics and descriptions of the lights displayed by different vessels at night, while the Day Shapes section features graphics and descriptions of shapes displayed during daylight. The Test Yourself section features multiple combinations of lights and shapes to test your knowledge. The ColRegs section contains the rules in full. The app is positively evaluated by professional pilots for reliability and researched and produced by nautical and marine experts for accuracy. It is an excellent learning tool for day skipper and similar courses worldwide, and a useful tool to assist trainers and trainees on Day Skipper and Yacht master courses.