Fantastic nautical bookshop across the street from the large Corte Ingles offering an impressive array of publications. There is a good range of books available in English, as well as French and German. They sell nautical charts in paper and digital format; their stock covers many parts of the globe.
They also have an online shop accessible through their website.

Tel: + (34) 971 460 001
www.libreriadenautica.com