Nautical Calculators by Vu Cong The is a free Android application that offers a wide range of tools for marine navigation and maneuvering. This app includes features such as Rhumb-Line Sailing, Great-Circle Sailing, Meridional parts, and Traverse Sailing. It also includes features like Current and Wind Sailing, Wheel Over, and Celestial Observations. The app provides a Nautical Almanac and allows users to find the name of a star. In addition, it has tools for calculating the standard deviation and error, course and speed of another ship, and closest point of approach (CPA).

Furthermore, the app provides information on the international regulations for preventing collisions at sea (COLREG), marine signaling, and maritime buoyage system. It also includes a glossary of marine navigation, maritime theory, and Vietnam lighthouses system. The app's interface is available in both English and Vietnamese. However, it is important to note that the app does not include any personal or contact information for the developer.

Overall, Nautical Calculators is a comprehensive navigation tool for anyone in the marine industry. It offers a wide range of features and information that can be useful for marine navigation and maneuvering.