Sea captains, also known as ship commanders, navigators, and boat skippers, are individuals who are responsible for the operation and direction of nautical vessels. The term skipper or skip is sometimes used as a synonym for sea captains. Another synonym for sea captains is master mariner, which is a term used for those who have extensive experience and knowledge of the sea and have achieved a certain level of certification. Boat owners may also refer to their captain as the helm, especially in smaller boats. Some common nicknames for sea captains include sailors, seafarers, and seamen. Regardless of the term used, sea captains play a vital role in the safe transport of people and goods across the oceans.