## 3 Results and Discussion
### High-Risk Zones Created by Cruise Ships' Routes
#### 3.1.8 Lastovo-Mjet Passage  
The passage between Lastovo island and Mjet island is precisely between Glavat island and Mjet island, which cruise ships use on northerly courses and on southerly courses when arriving/departing to or from Korcula island. During the summer season,there is dense sailing boat, yacht and leisure boat traffic, which often interacts with cruise ships' transit through the passage.  
During the research, 30 ships passed through the Lastovo-Mljet passage (Table A7). Traffic monitoring showed that two cruise ships met in the passage within a 3 M distance from the shore two times in a 90 min period. On six occasions, two cruise ships met in a crossing course 3 M to 6 M from the shore in a 90 min period.  
The results of the research give a new conclusion and new information from the paper 'Main sailing routes in the Adriatic' [10], in which one of conclusions states that maritime flow in the central Adriatic region is mostly directed through the Central Adriatic Separation Scheme and that maritime accidents are rare, which indicates good maritime coordination. Additionally, in a statement in the paper 'Analysis of the maritime traffic in central part of the Adriatic' [9], one of the conclusions states that the greater part of the longitudinal sailing route extends in the area of sufficient depth and width where there is no significant danger to navigation with the exception of the danger of collision with opposite and transverse traffic and the danger of grounding in the broader area of Palagruz island.  
The study brought elevated navigational, safety and environmental risks in the navigationally less defined region of the central and south Adriatic east coast to our attention. The present cruise routing practice presents serious environmental and safety risks to protected areas of the Lastovo Natural Park, Susac island and the Mljet National Park because the preserved natural ambience and ecosystems give these locations high natural, national and international value.  
The analysis of cruise ship movement shows that high-risk routes are repetitive and have become navigational standard routine for cruise ships. This practice questions efficient maritime coordination in the researched area. It is of high importance that cruise traffic expansion is well controlled and equally complemented with investment, the development of routing systems, the implementation of restricted areas, efficient traffic control and straightened maritime regulations in order to ensure the sustainable development of the central and south Adriatic east coast.  
This research showed the standard cruise shipping navigational practices in coastal navigation in areas that have been recently discovered by the cruise industry. The observed cruise ship routing practice can be related to any costal region where strong cruise traffic expansion has not been equally supported by investment, the development of routing systems, the implementation of restricted areas and efficient marine traffic coordination. The results are not only related to the central and south part of the Adriatic east coast; on the contrary, they show cruise ships' navigational practice that can be associated globally to any developing cruise region.