This application was developed to provide simple, clear information deemed essential to deal with accidents and illnesses at sea. It will explain how to make use of the free tele-medical assistance service from TMAS centres, which provides a 24 hours health service for seafarers around the world. Within the application the buttons/links to "how to contact the doctor” are always fully visible. The texts, characterized by a common use terminology with the rigour given by the constant supervision of medical specialists, are drawn for easy understanding by any user. Designed to act in real time, the application "Doctor on board" is also developed to deepen your own knowledge through a large information and training section on medical techniques, the composition of the first aid kit, good prevention rules, radio call procedures and responsibilities on board. These are some of the features of an application that really helps! For more information watch the tutorial on youtube searching "Tutorial Doctor on board".