Practicing is an activity based on knowledge of the accidents and characteristic points of the area where it is developed. It is carried out in stretches of the coast, in bays, ports, estuaries of rivers, lakes, terminals and channels where there is traffic of ships. The main reason for the existence of this service is to provide greater efficiency and safety to the navigation and to guarantee the protection of the society and preservation of the environment. Practitioners are the professionals who carry out this work. They have great experience and technical knowledge of navigation and maneuvering of ships, as well as local peculiarities. This function is carried out on board ships to which the practitioners are driven by means of boats which have special standards for the safe transshipment of the Practical.