The steering gear system
分类：轮机英语小册子
The total system may be considered made up of three parts: control equipment, a power unit and a transmission to the rudder stock.
The first part conveys a signal or desired rudder angle from the bridge (wheel house)
The second one provides the force, when required, to move the rudder to that angle.
The third is the means by which the movement or the rudder is accomplished.