Abstract: A projectile guidance system employs entry and exit ports for the ambient fluid medium with fluidic circuits interconnecting various of the entry and exit ports so that asymmetry of the flow through the ports will be induced merely by regulating the flow in any given fluidic circuit. Control means signalling trajectory correction instructions is effective to regulate the flow to orient the asymmetry such as to induce the desired yawing torque on the projectile. Where the projectile is spinning the regulating effect will be switched between the ports and will be effective at a station 90.degree. displaced about the projectile longitudinal axis of symmetry from the direction in which yawing movement is desired.