The invention is a marine wing-in-ground effect vehicle capable of sustained high speed operation in varying seas. The vehicle comprises an aerodynamic flat bottom lifting wing with a fuselage, a longitudinal keel member under the wing, a propulsion unit installed in the keel member, a vertical stabilizer airfoil mounted on top of the wing, and an overturn prevention tail at an aft end the wing. Port and starboard surface foils are pivotably mounted under the wing, and taper from a wider front end to a substantially narrow trailing end. The surface foils are selectively and independently pivoted between a deployed position and a retracted position by an actuator.