Abstract: A keel-less “vehicle” (boat, boat body, gliding device or locomotive device or boat device) is to be designed in such a way that it is equally suitable for use, preferably for rescue missions, on water and ice surfaces. For this purpose, an engine-driven locomotive device comprising a catamaran-like main body of at least two parallel, mutually spaced, inflatable tube bodies (1, 2) and a bottom (6) disposed between said tube bodies at a distance from the respective tube body underside (4) and a propeller propulsion (25) supportable on the vehicle body is suggested.