Before dissecting the manual, it is essential to appreciate the complexity of the machinery it describes. Unlike a traditional fixed-pitch propeller system connected to a long propeller shaft, an azimuth thruster is a self-contained unit. It consists of a propulsion motor (electric or diesel-driven) located inside the hull, connected via gearing to a pod that hangs below the ship.

The ability to rotate the thruster relies on a steering motor and pinion gear engaging with a slewing ring.