books.google.be - The first sailors braved the North Sea and the Baltic in open wooden boats: their aims were varied - to fish, to trade, to conquer and plunder. Without maps or compasses, they steered by the sun or by landmarks on the coast. Nevertheless they discovered Iceland and North America and explored the rivers...http://books.google.be/books/about/Seafarers_Merchants_and_Pirates.html?hl=nl&id=i7-HX1Dx_b8C&utm_source=gb-gplus-shareSeafarers, Merchants and Pirates
