Because of the high degree of safety on board, it is expected that in every given moment ship's crew know all data about ship stability. In every given moment ship needs to comply with IMO regulations. That is why we need to do everything possible to help ships crew to get all stability calculations of ship's dinamic and static data in easiest way and form. That is why ship's crew get all data about hydrostatics and damage stability booklets. All that data comes on board in paper form, but ship's crew also get the Loading instruments in computer program form. Loading instruments give crew very fast and reliable calculations in very short period of time about all data that concerns ship stability. The objective of this article is to analyse hydrostatic tables of the passanger ship on the cruise line and to make attention on the most usefull data in hydrostatic tables and how to manage them. Also, data is going to be analysed with Loading instruments because they make the progress very fast and reliable.