Examines current and prospective use of simulation in training for US Navy Ships. A number of naval exercises can be conducted in port, using various forms of simulation, rather than at sea. Some groups, such as commercial shipping, already rely more heavily on such training than the US Navy does. Can the US Navy do the same, yet still maintain or improve readiness? The authors look at current uses of simulation and suggest ways to best use underway and simulation training time and strategies for implementation.