Final answer:
A lookout on a vessel is required at all times to ensure the safety of the vessel and its crew members. Lookouts play a crucial role in preventing collisions and alerting the captain to potential dangers such as other vessels, bad weather, or proximity to land.
Step-by-step explanation:
A lookout on a vessel is required at all times. Lookouts play a crucial role in maintaining the safety of the vessel and the crew members on board. They keep watch for any potential dangers such as other vessels, land, or bad weather conditions, and help the captain navigate through these situations.
For example, if a vessel is near another vessel, a lookout can help prevent collisions by providing early warning and ensuring a safe distance is maintained. Similarly, in bad weather, a lookout can keep an eye out for any changes in weather conditions, such as approaching storms or fog, and alert the captain so appropriate actions can be taken.