What is the maximum distance a vessel is considered in coastal waters?

The maximum distance a vessel is considered to be in coastal waters is generally defined as 3 nautical miles (NM). This designation stems from various regulations and international maritime conventions, where the 3 NM limit is often utilized to delineate the boundary between the territorial sea and the waters that are generally classified as high seas. Within this zone, states have specific rights to regulate activities and enforce laws.

Being within the 3 NM coastal zone is crucial for a range of operations, including search and rescue, law enforcement, and environmental protection, as it allows for enforcement of national laws and responsibilities over marine resources. Knowing this limit is essential for a Deck Watch Officer to effectively conduct their duties and ensure compliance with maritime regulations.