In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Seashore
If you dream that you are sitting along a calm seashore and see a ship approaching, your wishes will come true. If, however, there are crashing waves then expect troubles ahead.