What defines a safe speed for a vessel?

A safe speed for a vessel is defined as one that allows the vessel to stop within the distance of visibility. This means that when navigating, the vessel's operator should be able to perceive any potential hazards, such as other vessels, navigational markers, or obstructions, and have sufficient distance to react appropriately. This is particularly important in conditions of reduced visibility, such as fog or heavy rain, where stopping distances are extended.

By adhering to this definition, the vessel can be operated in a manner that prioritizes safety, ensuring that navigational decisions can be made with enough time to avoid collisions or grounding. The requirement for vessels to maintain a speed that allows for safe stopping distances also aligns with international regulations, notably the Collision Regulations (COLREGs), which emphasize the need for vessels to navigate at safe speeds.

In contrast, a speed that allows vessel control may not take into account the specific distance required for stopping, particularly in challenging conditions. A maximum speed without restrictions does not consider environmental factors or other vessels specific to a given situation. A speed based solely on crew experience might neglect critical navigational and mechanical limitations that could lead to unsafe situations. Thus, the emphasis on stopping within visibility distance provides a concrete and universally applicable standard for establishing safe speed.