Device for controlling the navigation of a towed underwater object, the device comprising: - a body having a longitudinal axis and comprising: * a stationary inner portion that is constrained in rotation relative to the towed underwater object and provided with fastener means (53, 55) for fastening it releasably to said object, and * an outer shell that is movable in rotation relative to the stationary inner portion about said longitudinal axis, - a plurality of stabilizer fins (7a, 7b, 7c), each of which coupled to the body and extending along an axis (13a, 13b, 13c) that is transverse to the longitudinal axis of said body, each fin being orientable relative to the body by pivoting about its transverse axis by means of a rotary drive system (31, 35, 39, 45) and by control means, so as to modify the angles of inclination of said fins, each fin (7a, 7b, 7c) being coupled to a shaft extending substantially radially relative to said longitudinal axis, each shaft of a fin (7a, 7b, 7c) passing through the movable outer shell so as to be mounted to turn, with this outer shell and about said longitudinal axis, about said inner portion, in which the shaft concerned cooperates with said rotary drive system for pivoting each fin (7a, 7b, 7c) about its corresponding transverse axis (13a, 13b, 13c), characterized in that the device comprises at least three fins (7a, 7b, 7c) disposed about the longitudinal axis, with two lower fins defining between them a "V" and a upper fin that is substantially vertical, said control means acting on said fins to adapt the depth of immersion and the lateral position of the device relative to a reference axis along which the towed underwater object globally extends. - a body having a longitudinal axis and comprising: * a stationary inner portion that is constrained in rotation relative to the towed underwater object and provided with fastener means (53, 55) for fastening it releasably to said object, and * an outer shell that is movable in rotation relative to the stationary inner portion about said longitudinal axis, * a stationary inner portion that is constrained in rotation relative to the towed underwater object and provided with fastener means (53, 55) for fastening it releasably to said object, and * an outer shell that is movable in rotation relative to the stationary inner portion about said longitudinal axis, - a plurality of stabilizer fins (7a, 7b, 7c), each of which coupled to the body and extending along an axis (13a, 13b, 13c) that is transverse to the longitudinal axis of said body, each fin being orientable relative to the body by pivoting about its transverse axis by means of a rotary drive system (31, 35, 39, 45) and by control means, so as to modify the angles of inclination of said fins, each fin (7a, 7b, 7c) being coupled to a shaft extending substantially radially relative to said longitudinal axis, each shaft of a fin (7a, 7b, 7c) passing through the movable outer shell so as to be mounted to turn, with this outer shell and about said longitudinal axis, about said inner portion, in which the shaft concerned cooperates with said rotary drive system for pivoting each fin (7a, 7b, 7c) about its corresponding transverse axis (13a, 13b, 13c), characterized in that the device comprises at least three fins (7a, 7b, 7c) disposed about the longitudinal axis, with two lower fins defining between them a "V" and a upper fin that is substantially vertical, said control means acting on said fins to adapt the depth of immersion and the lateral position of the device relative to a reference axis along which the towed underwater object globally extends.