NavList:

Basque country belongs to Spain and France, two nations in war during centuries. In XIV century the industry of the whale and cod had increased and was generating big profit. After Cristobal Colón, Columbus, Spanish navigators do not explored northen coast of America, Caboto (England 1497) and Cartier( France 1534 ) done.

In 1565 the Basque whaler San Juan was sunk in Red Bay, Newfoundland Labrador, (see attached nautical charts). This well documented evidences  are the starting point for many theories that said Basque navigators and fishermen maintained in secret their routes before Colón discovery. All hypothesys...

Is fact that in the XVII century Basque people teached English and Dutch fishers to hunt whales, and the spanish king declared this illegal, and prosecuted that men. 

But the question is: they went there, how they navigated?, are the latitude by Polaris and LAN fix for latitude enough accurate in those days? amazing indeed!