What motivated the 16th century explorers? The question is a vexed one the world over. To this day, a troubled folkloric status hangs about the better-known names. Many of the Tudor explorers set sail from the South West peninsula. Morpurgo, with his own deep connections to the Dorset coast, unearths the stories behind little-known key figures Stephen Borough and John Davis, and their brilliant navigational teacher, John Dee, inventor of the ‘paradoxall compass’.