Easier with zero points of reference

Mom and I were getting ready to go out, last night, and she was telling me how proud she was that she'd successfully navigated her way around the Paris metro all day. "But, Mom, you circumnavigated the planet on a small sailboat." "Yeah, but getting around is way easier on the open ocean. I mean, you don't really have to know where you're going, as long as you point in the right direction and avoid obstacles." ..