Seagoing is a term that describes anything that can operate or travel on the sea. Synonyms for seagoing include marine, ocean-going, navigable, seafaring, and maritime. These words are often used to describe ships, boats, and other vessels that are designed to withstand the rigors of the ocean. Marine and ocean-going are used interchangeably to describe large ships and vessels that can travel across the open ocean. Navigable is used to describe waterways that are safe and deep enough for ships to travel through. Seafaring and maritime are used to describe the people and industries that work on the sea, such as sailors, fishermen, and shipping companies.