Navatek Applied Research is the developer of the module- based, coupled mechanical integration tool . NavaSim allows, via a series of connectors to external codes, the simulation of large complex, nonlinear problems. Because the modules are kept completely separate, each tool can be left to do the job it was meant for: CFD for hydrodynamic forces, elastic model for impact calculations, high speed corrections for planing boats, control actuation for actively controlled systems, waterjet models when appropriate, linkage models when objects are connected, etc. This tool is powerful and adaptable enough to have been applied to systems ranging from beaching amphibious vehicles and wave-powered boats, to inflatable causeways and wave-energy-converters.