All types of bathymetric information and its properties are presented. The entire process of creating bathymetric information, beginning from the planning of the bathymetric survey to the post-processing of bathymetric measurements, is described. This process is expressed in terms of the set theory. Therefore, the description of this very complicated process has become easier and more understandable.

In this paper, an attempt has been made to present the subject and state of the three main functions of each maritime country; these are: the maritime safety, maritime security and maritime defense functions. There have been also discussed the subjects of these functions as well as the reasons and process of the closest and closest cooperation between these functions, and even the merger of these functions in one maritime function, i.e. in the maritime safety, security and defense functions Especially quickly proceeds the merger of the maritime security and maritime defense functions in one maritime function, i.e. in maritime security and defense function.

In this paper, there are presented and discussed the issues regarding the perfection of the information services of the maritime navigation. Although the today developmentpsilas level of information and communications technology (ICT) allow to solve almost every hardware and software issue of information systems, nevertheless there exist very many issues of the maritime navigation information services that considerable impede the safety, security and efficiency of the maritime transport and the protection of the marine environment. The reasons of the above situation is a huge and permanent increase of the kinds and amounts of maritime information that must be taken into account during the realization process of maritime navigation.

In this paper, there has been presented the today - development's state of maritime navigation, main factors characterizing this stage of development and factors generating the current changes in all aspects of maritime navigation. There has been also made an attempt to show the most probable changes in maritime navigation that might be expected in the nearest future.

This paper discusses the necessity of further fast development of the new ship's navigation system for XXI century. The main issues constituting the subject of this paper have been presented.

This paper discusses the main issues of today's maritime navigation and its safety and security systems. Fast development of sciences and technologies, further fast development in the shipping industry, but mainly the appearance of the new very dangerous threats at sea that appeared at the beginning of this century, deeply influence the safety and security of maritime navigation and its systems. These factors are the main reasons for writing this paper.