Delta-Test СУДОВОДИТЕЛЬ is a software program developed by iDGG for Android devices. This program is designed to test the knowledge of captains, senior officers, and watchkeeping assistants. It features a database of over 1,200 questions covering a wide range of topics related to nautical science. The program allows users to take the test with or without comments and on a timed or untimed basis. At the end of the test, the program generates a list of tasks with errors. Delta-Test СУДОВОДИТЕЛЬ is a useful tool for those who want to improve their knowledge and skills in the field of navigation. The program is available in the Education & Reference category of the Google Play Store.