In terms of navigation, the Viking sailors used whale sightings to decipher and determine the course of their journey. In addition to whales, the then prescribed methods using the sun as a focal navigating point was also used by the Viking navigators. Moreover, Viking ships were supposed to be known as the most robust and beautiful ships of the ancient marine world.
"I felt that way about a ship once. My first command. Found her rusting in the Mersey...gear all foul and a pig stye below. Always swore she sailed twice as sweetly for me as she did for any other Master out of gratitude." More