Purpose of this site is to propose shortly the precepts, the fundamental notions of the discipline or better of the Art of Navigation. The author is a “sea wolf ” has deliberately conciliated the scientific rigor and the skill of particular technicians of the treatment with a discursive tone that makes reading smooth and easy. The reader will feel “on board”, intent on scrutinizing the celestial vault, in search of the stars and their laws; it will take into conctact with known instruments such as the compass and the stopwatch, or less known, such as the log and the radiogoniometer. Will know how to determine “position of the ship” and will experience live what it means “leeway” or “drift”. From his boat, he will easily detect the coastal areas of the coast, spotlights, lights and traffic lights. He will find a safe and complete guide especially in those chapters dealing with nautical instruments and estimated navigation.