## 1 Introduction
Each system was created considering the possibility to apply specific services offered [1]:  
* An Information Service is provided by broadcasting information at fixed times and intervals or when deemed necessary by the VTS system or at the request of a vessel and may include, for example, reports on the position, identity and intentions of other traffic participants, waterway conditions, weather, hazards, or other factors that may affect the vessel movement;
* A Navigational Assistance Service is particularly important in difficult navigational or meteorological conditions or in the event of faults or deficiencies. This service is normally provided at the request of a vessel or by the VTS system when deemed necessary;
* A Traffic Organization Service refers to the operational management of traffic and planning of vessel movements to prevent congestion and the occurrence of dangerous situations and is particularly important during periods of heavy traffic or when the movement of special transport means may affect the traffic of other ships. This service may also include the establishment and operation of a traffic clearance system or VTS system nautical plans or both, regarding traffic priorities, space allocation, mandatory reporting in the VTS system area, routes to be followed, speed limits to be observed or other appropriate measures when deemed necessary. VTS systems in Poland offer a task-specific set of services (Table 1). \begin{table}
\begin{tabular}{c c c} \hline \hline
**VTS System** & **Main Objective** & **Offered Services** \\ \hline \hline  & To ensure the safety of navigation for & \\  & vessels calling at ports located on the & \\  & coast of the Gulf of Gd\#  
It should be noted that VTS systems operating in Poland differ in terms of functions and particular characteristics that should be adjusted to the current regulations introduced by the International Maritime Organization (IMO) and European Parliament [1,2,13]. VTS systems development is a complicated decision-making process. Therefore, it is reasonable to analyze in detail the individual features of these systems. This article aims to review and assess the adjustment of VTS systems operating in Poland to current selected regulations introduced by IMO and European Parliament. The VTS systems operating in the area of Polish territorial waters were characterized and compared. Particular attention was paid to the adjustment of these systems to the Resolution A.1158(32) Guidelines for Vessel Traffic Services [13], Regulation No 1315/2013 of the European Parliament and of the Council on Union guidelines for the development of the trans-European transport network (TEN-T) in the European Union (EU) [14]. The novelty of the presented research deals with conducting a comparative analysis of the VTS systems operating in Poland, as well as assessment of the VTS systems' impact on the trans-European transport network development. Recommendations to improve the VTS systems operated in Poland were proposed. This article includes Section 2, where the literature review results are presented. The methodology used to conduct the research is described in Section 3. The research results are presented in Section 4, where the effects of the comparative analysis of the VTS systems are shown. The discussion of the achieved results is shown in Section 5. In order to summarize the research results, recommendations to improve the operation of the VTS systems were developed and conclusions were drawn (Section 6).