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Daikoukai Jidai (大航海時代) is a simulation game by Koei in their Rékoeition series. It was first released in 1990 on various Japanese computers before being ported to a variety of other platforms, including a port to the Sega Mega Drive in 1992. Western releases called the game Uncharted Waters. It was followed by Daikoukai Jidai II/New Horizons.