Abstract: A control system for jet-powered boats includes a water jet propulsion group; an ejection nozzle of the water jet oriented to direct the water jet at least in a longitudinal direction; a jet deflector changing flow direction of at least part of the water relative to the longitudinal axis of the boat, the deflector being controllable to progressively adjust the part of the diverted water jet and set a neutral thrust condition, in which the boat is stationary, thrusting forward with variable speed and thrusting backward with a predetermined or variable speed; a control member of the deflector position; a setting member of the deflector that adjusts the deflector to achieve a neutral thrust condition, the deflector being adapted for a predetermined and pre-set neutral thrust position; and a control member of the deflector in the preset position of neutral thrust, canceling any subsequent customization settings.