Knowledge worth keeping. Ideas worth sharing.
An independent notebook by Nguyễn Đình Thuyên, for students, seafarers and anyone who wants to understand how things work.
This space grows from a simple wish: preserve useful knowledge and pass it on clearly. Maritime systems, networks, electricity, recovery and astronomy meet here through short explanations and practical questions.
How to use this notebook
Begin with a question. Read the three essentials, trace the diagram and try explaining the example without looking. Use the sources when you need depth or precision.
A place to learn
This is an independent reference website, not an accredited school or a certification course. Marine and electrical articles teach concepts; onboard work follows the vessel’s approved procedures and qualified supervision. No affiliation with the organisations cited is implied.
Your reading stays with you
Saved lessons and progress stay in this browser. No account is required. Clearing browser data removes these preferences. There is no advertising or analytics tracking on this site.
Learning materials
The maritime cyber lessons draw on course materials shared by Nguyễn Đình Thuyên: the seafarer cybersecurity lecture by ThS. Nguyễn Duy Hiếu and the maritime cyber resilience presentation by Nguyễn Văn Thư. The supplied self-test helped identify topics to practise. Lessons are independently condensed and checked against the linked IMO, IACS, NIST and CISA sources; they are not an official course or certificate.