The nautical atlas measures 28 x 36 centimeters (11 x 14 inches), and contains seven nautical charts representing the Mediterranean basin, North Africa, and northern Europe, along with a round world map, a Ptolemaic planisphere, and an explanation of the so-called “toleta de marteloio”, a trigonometric table used with a compass to calculate navigation routes. In this work Bianco brings together all the diverse languages available in the first half of the 15th century for the graphic representation of geographic space.