Sea Rules+ is an aid in your understanding and learning of the international navigation rules about lights and day shapes, for professional and recreational mariners.
Sea Rules provides advanced graphic, simple text and a wide test section to check your skills.
You'll be able to quickly learn rules just looking at a single 3d picture.
In the test section of Sea Rules you can guess and check if you're right.
When at sea, close to a ship at night, you won't have any multiple choice!
Either if you are studying for captain's licence or you have a bit of rust on your knowledge, Sea Rules+ is an excellent resource.