Electronic Performance Support Systems (EPSS) have been demonstrated to reduce training time while increasing on-the-job performance in a number of different application areas. This paper describes a major study, carried out by BAE SYSTEMS Prime Contract Office for the Royal Navy s Type 45 Air Defence Destroyer, into the potential of EPSS techniques to provide a holistic whole-ship support environment for the ship s company. The study includes consideration of the applicability of EPSS to the variety of tasks carried out on board, the data structures required to provide seamless integration between varying types of material while maintaining their context, and the technical standards which are required to underpin this approach. The paper will also discuss the prototype EPSS being developed for a major ship equipment in support of the study, and includes some early lessons learnt from the development process.