Main steering should be able to function effectively at what speed?

The ability for main steering to function effectively at maximum service speed is crucial for the safety and maneuverability of the vessel. At maximum service speed, the vessel operates under the conditions that will be experienced during critical maneuvers, such as docking or navigating through narrow or congested waters. This capability ensures that the steering system can respond adequately to sudden changes in course or speed, providing the helmsman with precise control over the vessel.

Operating a vessel at maximum service speed also tests the steering system under the most demanding conditions it might encounter, ensuring that it can withstand the forces of water and the ship's momentum. This level of performance is vital in scenarios where swift action is required to prevent accidents or to comply with navigational regulations. Having an effective steering system at maximum service speed demonstrates that the vessel is seaworthy and that the steering gear is in optimal working condition.