It is because that's a basis. It is very difficult to navigate without charts. You need to have very good charts. It is even a legal requirement to have charts on board and to have the latest updated version. Those are actually the basics of navigation—to have a ship and a chart. You need to know where you are going. That's very basic. I don't know what else I can say.
On October 7th, 2014. See this statement in context.