Which position reference system mix is suitable for lifting activities in proximity to other offshore structures in greater than 350m depth?

The chosen response is suitable for several reasons, particularly when considering the specific requirements for lifting activities in deep water while accounting for nearby offshore structures.

Acoustic (SBL, or Spatial Beacons Location) systems can provide precise positioning in deep water environments, typically over depths like 350 meters. This method is especially effective in offshore settings where visual referencing is challenging. It uses sound waves to determine the distance and position from the underwater beacons to the surface vessel, making it reliable for dynamic positioning.

DARPS (Differential Acoustic Reference Positioning System) adds another layer of accuracy by providing real-time corrections to the acoustic positioning, which is beneficial in environments where precision is critical due to the proximity to other offshore structures. It helps mitigate potential errors that could arise from acoustic delays or environmental factors.

DGNSS (Differential Global Navigation Satellite System) enhances positioning accuracy by correcting satellite-based GPS signals with ground-based stations, ensuring more reliable data, critical during lifting operations that require precise positioning especially in congested areas.

In summary, this combination of systems—Acoustic (SBL), DARPS, and DGNSS—provides a robust and accurate positioning solution suitable for deep-water lifting operations close to other structures, utilizing the strengths of each system to