Ports of nautical tourism with reference to marinas play a very important role in nautical tourism of the Republic of Croatia on the coastal areas, including the Primorje-Gorski Kotar County. Marina Punat is the largest marina in Croatia, and this paper provides an in-depth quantitative analysis of the efficiency and success of Marina Punat. Based on the analysis, the results of the work indicate that Marina Punat has different mooring lengths ranging from 8 to 40 meters on land and at sea, and with the merger of the company Brodica d.o.o. expanded accommodation facilities. The number of active contracts is increasing regardless of the period of the Covid-19 virus. Analyzing the structure of the guests, data shows that Marina Punat is a world-famous marina and that the majority of guests come from Germany. The transit berth is no longer as visited as it was before the Covid-19 pandemic. Marina Punat offers a black tank emptying service which is free, but unfortunately not used enough. By reviewing and analyzing data on electricity and water consumption, Marina Punat has large amounts of electricity and water consumed. The performance indicators of Marina Punat show the positive performance of the marina despite the global Covid-19 crisis. Marina Punat follows all its strategic goals and with its investment and development plan it will offer maximum service and achieve a new, modernized look.