Why do ships always have ebb and flow tables?

When entering a port with high ebb and flow, you need to know their schedule in order to enter the port during high tide, and safely leave the port during the next high tide.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.