The ever-increasing sophistication of petroleum derivatives and dangerous and noxious chemicals carried by sea has resulted in a corresponding increase in the precautions taken by coastal states. High in importance amongst these precautions has been the introduction of Vessel Traffic Services, constituting shore-based organizations fulfilling a variety of functions, often based on advanced radar techniques. The kernel of any such system is communication, chiefly between shore and ship, ship and shore, but including communication ship to ship. Without such communications information cannot be passed, and advice and instructions cannot be given. This thesis describes the theoretical and practical linguistic research and application that has taken place in the field of Vessel Traffic Services. It offers solutions to existing and predicted communication events, chiefly by voice, but including concepts embodying VDU techniques. Further, it describes practical trials that have been carried out, and procedures which have been instituted as a result of the overall research detailed herein.