Which factor is NOT considered when determining safe speed for a vessel?

In evaluating the safe speed of a vessel, several factors come into play, including visibility conditions, current weather patterns, and the presence of navigational hazards. These elements directly affect the ability of the vessel to maneuver and react to changing conditions.

Visibility conditions refer to how far ahead a vessel's crew can see, which greatly influences their capacity to navigate safely and respond to potential hazards. Weather patterns also play a critical role, as adverse conditions such as high winds or rough seas can limit maneuverability and increase stopping distances. The presence of navigational hazards is essential for determining safe speed; knowing where rocks, shallow areas, or other vessels are located can dictate how fast a vessel should be moving to avoid collisions or grounding.

While engine power capacity is certainly an important consideration for a vessel's overall operational capabilities, it does not directly influence the assessment of safe speed in the same manner as environmental factors do. Engine capacity affects the vessel’s maximum speed and efficiency but does not account for the safety implications posed by various navigational challenges. Therefore, engine power capacity is not a factor that is specifically considered when determining safe speed.