Scotland's seas are among the deadliest in the world. Only the most skilled of mariners can navigate the country's wild waters - among them, Captain Eric Smith of the Northern Lighthouse Board. As skipper of their tender vessels - the Pharos and Pole Star - it's Eric's job to sail to the places other mariners are told to avoid. In 'Sgiobair nan Taighean-solais', the story of today's Northern Lighthouse Board is told through one of its most experienced skippers. As he celebrates three decades with the NLB, the programmes follows Eric over a year at sea as he and his crew sail between the country's vast network of navigational aids.