When navigating in restricted visibility, vessels must maintain a __________.

When navigating in restricted visibility, maintaining a speed suitable for maneuvering is critical for safety and effective navigation. This speed allows the vessel to react appropriately to any potential hazards or obstacles that may arise in conditions where visibility is significantly reduced. It enables the operator to stop or change course quickly, thereby minimizing the risk of collisions or other accidents.

Navigating at a steady course without the ability to adjust quickly or at high speed could lead to dangerous situations, especially since other vessels may also be navigating nearby under the same restricted visibility conditions. A complete stop may potentially hinder the vessel's ability to avoid danger as well; it may not be able to move out of the way of another vessel or hazard. Therefore, maintaining a suitable speed for maneuvering ensures that the vessel remains in a safe operational mode while still being able to make necessary adjustments as the situation dictates.