What is not affected when positioning using a Fanbeam reference system?

When utilizing a Fanbeam reference system for positioning, the aspect that remains unaffected is the interference from the vessel's radio transmissions. This system relies on laser technology to determine the position of the vessel with respect to a known reference point. It functions independently of the radio frequency environment surrounding the vessel. Thus, while other elements such as environmental water currents, weight distribution, and the vessel’s speed can influence overall vessel performance and stability, the integrity of the Fanbeam system's operational capability is maintained regardless of any radio interference or transmissions from the vessel.

In contrast, environmental factors like water currents can significantly impact a vessel's ability to maintain its position, as these external forces can push or pull the vessel off its designated path. Similarly, weight distribution can affect a vessel's stability and how it responds to external forces. Lastly, the vessel's speed during operation can create dynamic forces that impact positioning when under control. Therefore, while these factors are critical to the overall operation of a vessel in dynamic positioning, they do not perturb the functioning of the Fanbeam reference system itself.