The skipper must be well aware of the maneuverability of his vessel, as well as the capabilities of the ship's controls to perform a particular maneuver. In the» Information «about the parameters of turnability, which is available on the ship, there is no data on the performance of such an important maneuver as «turn in place», which is often used in a confined area of water. Some assumptions have been taken in this article and the solution of the system of equations of the motion of the vessel in relation to the considered maneuver is proposed. The author obtained analytical expressions for calculation of angular speed and the angle of turn of the vessel at the time of the maneuver of «acceleration», the rotation by inertia and active damping rotational inertia. Using the obtained expressions, the calculation of the parameters of the turnover of the project 507 ship was performed. Graphs of the dependence of the angular speed and the angle of rotation of the vessel on the maneuver time are given.