The subject of this this thesis is developing a model of classification and charting of dangerous entities of the underwater environment. The existing nautical charts show the entities of the underwater environment. However, they do not show the possible danger levels of these entities. Navigational publications give only limitations which refer to the possible dangers of these entities for maritime navigation and for example demersal fishing. The suggested model of classification enables creation of bathymetric charts of the underwater environment on which it is possible to show the danger levels of these entities. Application of the charting model in the creation of the bathymetric charts of the underwater environment would be done by hydrographic organizations. It is suggested to create the bathymetric charts of the underwater environment for two groups of users. The first group are state or private organizations or services to whom the data on the state of marine environment are important, while the other group are specialized govermental agencies and state bodies who primarily engage in activities related to defence and security. Creation of these charts and to them related database provides a comprehensive approach to the issue of security of the underwater environment as an integral part of national security. These charts improve the level of security in carrying out offshore and underwater activities as well as the level of safety of navigation to some extent. By applying the suggested model of charting of dangerous entities in creation of bathymetric charts of the underwater environment it is possible to use it worldwide.