What does bank suction refer to in boating terminology?

Bank suction refers to the phenomenon where the stern of a boat is drawn toward the bank when navigating close to the shoreline. This occurs due to the effect of the water moving alongside the hull of the vessel, which creates a differential pressure that pulls the stern in the direction of the bank.

When a boat is near a bank or shoreline, the water's flow tends to be affected by the proximity of solid land, resulting in a change in pressure on the sides of the boat. This can make it difficult to control the vessel, as the attraction to the bank can lead to a risk of grounding or collision with obstacles.

Understanding bank suction is crucial for navigating in confined waters, such as rivers and narrow channels, where the effects of shallow water can impact the movement of the vessel significantly. Recognizing this phenomenon allows a skillful operator to adjust their navigation techniques to maintain safe and effective control of their vessel.

The other provided options refer to various aspects of navigation but do not accurately describe the specific scenario of bank suction as recognized in boating terminology.