In the 18th century, new scientific equipment allowed explorers to survey land and sea with greater accuracy than ever before. Some of George Vancouver's maps, in fact, are still in use today. After joining the Hudson's Bay Company in 1750, Henday undertook an expedition to draw Prairie Indians into trade with the Company on Hudson Bay. In 1754, he travelled up the Hayes River and across the prairies between the North and South Saskatchewan rivers to reach the site of Red Deer, Alberta. He may have seen the Rockies from there. Artist Frederick Hagan of Newmarket, Ontario painted these four images, third in the series of Exploration stamps. Using a palette of vivid colours, he depicts the lands carted by four 18th century explorers. His imaginative backgrounds detail charts, map-making tools and the Discovery, the ship Vancouver sailed on his voyage around the world.