Regulations about way of marking of waterways and aids to navigation prescribe types and characteristics of aids to navigation in the internal sea waters and territorial sea of the Republic of Croatia, their classification and categorization, manner and conditions of their installation, maintenance, removal and deactivation, system of marking (balise) of waterways in the internal sea waters and territorial sea of the Republic of Croatia, manner and conditions of establishing and maintaining the Register of aids to navigation, its content and obligations of natural and legal persons who install or maintain aids to navigation.
In the internal sea waters and territorial sea of the Republic of Croatia, waterways are marked by the combined cardinal (basic) and lateral (side) marking system, in accordance with the international IALA marking system - Region A.
In the internal sea waters and territorial sea of the Republic of Croatia the following will be marked:
- the lateral limits of navigable channels
- natural navigational dangers and other obstacles for navigation (wrecks)
- navigational significant areas and structures
- new dangers to navigation.
The Maritime Buoyage System consists of the following types of marks that can be used alone or in combination:
The mark is fixed (constructed), floating, stuck, elastic and/or electronic means of the Maritime Buoyage System (balise) of waterways.
Meaning of marks depends on one or more characteristics, namely:
- by day - on their shape, topmark and colour,
- by night - on their colour, visibility sector and light rhythm.
Appropriate lights, signs and/or devices may be fitted to the marks.