If you have ever been on a ship, you might have realized navigation is the most technical and the most important part of sailing -- a slight error in calculation might literally sink you. And such errors, in the past, have been caused mostly by humans. Japan has found a unique solution to the problem -- self-navigating ships. These "smart ships" will find the safest, shortest and most fuel-efficient routes using artificial intelligence (AI) and could be put into service by 2025. The AI tech is expected to make shipping safer by not just potting the course, but also detecting machinery malfunctions and other problems way in advance.