The museum is located in a military building so you need a security check and ID. It is free but thanks for donations. The models of the ships are good and the exhibits are well planned. Shows the huge influence of the Spanish navy. Search for the oldest map in Aneriga - the world map by Juan de La Cosa, 1500. There is an exhibition in the Philippines. There is also an exhibition showing archaeological discoveries from the gallery. Great for naval enthusiasts and history buffs. About 5 minutes walk to Prado.