Master Nav is a set of marine learning apps designed to make exam preparation clearer, faster, and more practical. Developed by a Master Mariner with 25 plus years of seagoing experience, the apps focus on how mariners actually learn: visual recognition, simple explanations, memory aids, and answer phrasing that matches how the rules are examined.


Each app follows the same approach. Start in Learning to build understanding step by step, then move into Practice to test yourself with realistic questions and clear graphic answers. The aim is confident recall under pressure, not memorising paragraphs from a book.


Master Nav is a long term project created and maintained by a single developer. It is not built to make money. The goal is to steadily improve content and features over the coming years while keeping the cost as low as possible. The small fee helps cover unavoidable ongoing costs such as Apple and Google developer programme fees, hosting, and basic admin and legal requirements.


The apps improve because people use them, challenge them, and report issues. If you spot an error, please get in touch. If you can share past exam papers, marking guidance, or other training materials from your jurisdiction, it is genuinely appreciated and helps shape future regional versions.


Choose an app below to learn more.

MASTER-NAV: COLREGS


MASTER-NAV: IALA MBS