By Eric Sevareid Imagine two teenagers paddling a canoe from Minneapolis to the Hudson Bay without the benefits of GPS, cell phones or tracking systems. That is what Eric Sevareid and Walter C. Port chose to do in 1930. It was the day after graduation from high school when they launched their used 18-foot canoe filled with supplies into the Minnesota River at Fort Snelling, amidst goodbyes of family members. Their four-month journey covered more than 2,200 miles of rivers, lakes and difficult portages. On the side of the canoe, aptly named Sans Souci, which means “without care,” the boys…