This whole story of the Greenland settlement is historical fact which cannot be doubted. Partly by accident and partly by design, the Norsemen had been carried from Norway to the Orkneys and the Hebrides and Iceland, and from there to Greenland. This having happened, it was natural that their ships should go beyond Greenland itself. During the four hundred years in which the Norse ships went from Europe to Greenland, their navigators had neither chart nor compass, and they sailed huge open boats, carrying only a great square sail.