DYNAFLOW Inc. has released its new and improved ship-maneuvering software DYNASIM Version 4.0, incorporating state-of-the-art models of ship hydrodynamics. It achieves capabilities not found on more expensive stand-alone full-mission simulators. The software runs on Windows platforms and has a user-friendly interactive graphics interface. The ship simulator employs modularmathematical models for the various components of the ship (hull, propellers, rudders, thrusters);