A more thorough explanation:

Definition: A mariner is a person who works on a ship or boat and is responsible for navigating it on the sea. They are also known as seamen.

Examples:

• John has been working as a mariner for over 10 years.
• The ship's captain hired a team of experienced mariners to help navigate through the stormy waters.
• During the voyage, the mariners had to work together to ensure the safety of the ship and its crew.

The examples illustrate how a mariner is a person who works on a ship or boat and is responsible for navigating it on the sea. They are skilled professionals who have experience in handling different types of vessels and are trained to deal with various situations that may arise during a voyage. Their main job is to ensure the safety of the ship, its crew, and the cargo it carries.