On Equipment Class 3 vessels, to what should one of each type of sensor be connected?

For Equipment Class 3 vessels, one of each type of sensor should be connected to the backup DP control systems. This configuration is crucial because Equipment Class 3 is designed to provide a high level of redundancy and reliability. In dynamic positioning systems, sensors play a vital role in providing accurate and real-time data to maintain the vessel's position.

Connecting sensors to the backup DP control systems ensures that if the main DP control system experiences a failure, the backup system can seamlessly take over without compromising the vessel's operational safety. This redundancy is essential in critical operations where any loss of position could lead to significant risks, such as collisions or grounding.

In contrast, connecting sensors solely to the main DP control systems may expose the vessel to significant risks if those systems fail. Similarly, while bridge navigation systems and external communication systems have their important functions, they are not designed to manage the real-time control and safety aspects of the DP operation as the dedicated DP systems are. Therefore, having each type of sensor connected to backup DP systems enhances the safety and reliability necessary for the operational integrity of Class 3 vessels.