Container traffic grew very fast and many ports have prepared infrastructure and superstructure for the container vessels. During the last decade, many of Eastern Baltic ports container terminals started working with container vessels and in the same time looked for the bigger container vessels with limited possible investments [1]. In many ports are very limit space inside the ports and it make additional difficulties increase entry to the ports ships size. Container terminals usually are located in the middle or in the end parts of the ports and find enough space for the ships turning basins raise difficulties. Big container vessels navigational safety must be linked with ports infrastructure, but very often ports are orientated on the old standards and design recommendations, so are trying to keep big safety coefficients regarding water ways depths, widths, and hydrometeorological conditions limitations. Old standards did not include new accuracy navigational equipment such as RTK systems, which are implemented in many ports and increase navigational possibilities and navigational safety. This paper addresses the theoretical approach of the influence of new big container vessels sailing within ports areas, namely ships turning basins, possibilities and navigational safety of the ships, which have big wind surface and good manoeuvrability