Today provides a convenient online database of all the world's navies and naval ships.
These lists include all significant naval vessels, from largest navies to the smallest and most obscure. In general the lists include all surface combatants, submarines, mine warfare vessels and patrol craft over 100 tons displacement, and all amphibious ships and auxiliaries over 500 tons displacement. Coast Guards, police forces, and vessels owned by non-naval branches of government generally are not included. Please see How To Read the Fleet Lists for information about the format of the lists, abbreviations used, etc. Your assistance in updating, checking and improving these lists is essential to the continued success of this project, and is very much appreciated.