Which standard must Dynamic Positioning (DP) ships meet according to international standards?

Dynamic Positioning (DP) ships are required to adhere to specific international standards that ensure their operational safety and reliability while maintaining position over the seabed. According to the International Maritime Organization (IMO) and various classification societies, DP systems are categorized into classes, with Class 2 and Class 3 being the most recognized for operational standards.

Class 2 DP systems provide a level of redundancy where the vessel can continue to maintain its position even if one component of the system fails. This class is essential for vessels that operate in environments where position-keeping is critical, such as during drilling operations, subsea construction, or in high-risk conditions.

Class 3 systems offer additional redundancy and can withstand multiple component failures, making them ideal for more sensitive operations where position accuracy is paramount. This high level of reliability is essential for operations that can't tolerate significant risks, such as that involving life support systems or heavy lifting operations.

In contrast, other classes mentioned, such as Class 1 or higher classifications like Class 4 and Class 5, do not meet the necessary operational safety requirements for the types of critical tasks typically performed by DP vessels. Thus, Class 2 or 3 is recognized as the appropriate standard for DP ships according to international standards.