What is the recommended mix of position reference systems for a DP Class 3 dive support vessel operating at a depth of 200m?

The recommended mix of position reference systems for a DP Class 3 dive support vessel operating at a depth of 200m is to utilize 2 DGNSS, 1 LBL acoustic array, and 1 taut wire. This combination is effective because it balances redundancy and accuracy, providing a reliable way to maintain station-keeping performance in a demanding operational environment.

Having two Differential Global Navigation Satellite Systems (DGNSS) enhances the vessel's position certainty by providing dual channel redundancy. This is crucial for Class 3 DP systems, which require high reliability and accuracy to ensure safe operations, particularly in underwater diving scenarios.

The inclusion of one Long Base Line (LBL) acoustic positioning system adds another layer of accuracy, particularly beneficial in deeper waters. LBL systems are known for their precision in underwater environments, which is essential when conducting operations at substantial depths, such as 200m.

Lastly, having one taut wire system complements the setup by providing direct measurement of the vessel’s position relative to the seabed through physical means. This enables quick adjustments and enhances situational awareness, especially useful in the complex underwater environment involved in diving operations.

Therefore, this mix of 2 DGNSS, 1 LBL, and 1 taut wire creates a