swing of the ship's bow) Hard rudder (Used infrequently, such as emergencies, when maximum rudder is required) Left or right standard rudder (~20 degrees. Varies per ship) Shift your rudder (Steer the same number of degrees but opposite rudder angle) Heading Steady as she goes (Steer as needed to continue current heading) Steady on a course (Steer as needed to bring ship on desired course) Acquired skills Steering a ship effectively requires skills gained through training and experience. An expert helmsman has a keen sense of how a particular ship will respond to the helm or how different sea conditions impact steering. For instance, experience teaches a helmsman the ability to correct the rudder in advance of a ship substantially falling off course. This requires the capacity to anticipate the delay between when the helm is applied and when the ship responds to the rudder. Similarly, a skilled helmsman will avoid overcompensating for a ship's movement caused by local conditions, such as wind, swells, currents, or rough seas. Ship simulators Computer-based ship simulators provide a training environment for learning skills to steer a ship. Training can be programmed to replicate a variety of ship sizes and environmental conditions. Scenarios depicted in 3-D graphics range from making course corrections in open waters to maneuvering in port, rivers, or other shallow waters. Cost compared to a real vessel is low. Mariners learn responses to dangerous situations, such as steering failure, in the safety of a virtual environment. Land-based ship simulators may feature a full-scale replica of a steering stand with a ship's wheel. Such simulators incorporate magnetic and gyro compasses (or repeaters) for steering. Moreover, a rudder angle indicator that responds appropriately to the helm is part of the configuration. However technology also allows for a multitude of smaller workstations in a classroom setting. Administrators network student workstations so that the instructor can launch individual scenarios at each station. Computer models are used to accurately simulate conditions such as wind, seas, and currents. Moreover, shallow-water effects or other hydrodynamic forces, such as ships passing close to each other, can also be depicted. A computer application records training sessions, complete with voice commands issued by the instructor which are received by the students via a headset. On the job training On-the-job training at sea is critical to a helmsman developing ability to "sense" or anticipate how a ship will respond in different conditions.