The ferry leaves Puerto Montt, and sails through the quiet waters of the Ancud Gulf, protected by the numerous islands of the Chiloé's Archipelago. After crossing the Moraleda Channel, the boat sails through the Penas Gulf, the only part of the journey at open seas. After some hours, the navigation continues through protected channels. The journey goes through the channels White, Sarmiento and Concepción, arriving on the morning of the 4th day in Puerto Natales.
During the high season there is a stop at Puerto Edén, to disembark local passengers and let the tourists have an idea of the living conditions of the people that live in this remote area. The boats also take a detour to the glacier Pío XI on the way south and to the Amalia glacier on the way north (without disembarking)
For a detailled description of the southwards trip:
For a detailled description of the northwards trip:

Navimag (Naviera Magallanes) uses on this route the ferry Evangelistas that transports vehicles, cargo and passengers. It has cabins of different categories, and berths in a dormitory. The ship has also common areas like a restaurant, a pub/cafeteria and panoramic decks.
Sometimes, Navimag uses a smaller ship called Amadeo that has only few cabins and is mainly built for the transport of cargo.