A common problem in maritime transport is a safety reduction in navigation, which increese probability of maritime accident. Because of that, there are supervising systems that controll maritime traffic from mainland. The objective of thesis is modeling and simulation of supervising system as part of VTS system which objective is to prevent crashes and improving safety inside canal. This thesis presents the work of supervising system using the example of maritime canal. The supervising system divides the canal into two routes and six sectors. Each sector is equipped with sensors so supervisor can track movement of ships. There can be only one ship in canal, and when it enters in canal, on both sides of canal lights up red light at traffic lights, and there is no allowed enterance in canal for others ships. In thesis there is synthesized supervising system that manages vessel traffic by using T-Petri nets, and verification of supervising system is carried out by computer simulation using Visua object-net.