The purpose of this paper is to analyze, on the basis of valid legal regulations, the issue of legal aspects of navigation safety on the coastal sea in the Republic of Croatia. In the Republic of Croatia, the conditions for navigation safety are determined by the Maritime Code, but also by European Union regulations, by-laws and technical rules issued by the Minister of Maritime Affairs. Navigation safety is a set of regulations that regulate the safety of ships in navigation at sea and on inland waterways. Also, the safety of navigation is a broader concept, so the paper also explains maritime objects that are intended for sea navigation or objects that are permanently moored or anchored at sea, that is, an object completely or partially buried in the seabed or laid on the seabed. A port area is an area of sea ports that includes one or more sea and land areas (port basin), which is used for carrying out port activities, and which is managed by the port authority, i.e. the concession holder, and the border of the port area is the border of maritime property. In order to carry out continuous safety control, this is the purpose of inspection in the field of navigation safety, which is carried out by navigation safety inspectors of the Ministry of Maritime Affairs and Port Authority. For those participants in maritime navigation who do not comply with legal and other regulations, they are subject to maritime and navigation violations.