What is the minimum maneuvering speed for fast rescue boats in calm water?

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Minimum maneuvering speed is the speed at which a fast rescue boat has enough rudder authority and propulsion to respond promptly to steering inputs and perform essential maneuvers. In calm water, this threshold is about 20 knots. At or above this speed, the rudder and propulsion can overcome water resistance and provide reliable control for turning, stopping, and positioning a rescue craft around people in the water or near other vessels. Going slower than 20 knots reduces rudder effectiveness and makes maneuvering sluggish and risky during operations. Higher speeds still provide control, but the requirement asks for the minimum speed, which is 20 knots.