According to the HELCOM AIS, there are about 2,000 ships in the Baltic marine area at any given moment. The main environmental effects of shipping and other activities at sea include air pollution, illegal deliberate and accidental discharges of oil, hazardous substances and other wastes, and the unintentional introduction of invasive alien organisms via ships’ ballast water or hulls. Original oil pollution model and optimal allocation of response resources was proposed in the paper.
 Gucma L., Przywarty M., The Model of Oil Spills Due to Ships Collisions in Southern Baltic Area, Conference proceedings TRANS’NAV 2007 ‘Advances in Marine Navigation and safety of sea transportation’, monograph, edited by Adam Weintrit, The Nautical Institute, Gdynia 2007.
 PISCES II User Manual, Transas Ltd, 2008.
 Specification for PISCES II, Transas Ltd, 2007.
 The national plan to combat hazards and pollution of the marine environment, Maritime Search and Rescue, Gdynia 2005.