If two vessels collide,the immediate cause may be that they did not follow COLREGs.To remedy this,the oow has to be taught the COLREGs this is obviously not the root cause ,as the oow should know the COLREGs in order to become a licensed officer.The root cause may be many different issues and it is essential that the company makes it a priority to investigate and find out what really caused the accident.It is usually not the first obvious cause,but to be able to remedy the real problem it needs to be identified and dealt with.It might be that the company did not check when they hired the oow whether he was competent or not,the oow was using technology that he had not been properly trained for,or misunderstood the displayed information;the oow had been working long hours because there were a limited number of officers onboard and there wasn't a proper lookout.