The iPod always comes with me when I'm out walking, but I usually only turn it on when I know I've got a long stretch ahead of me where I'm not going to need to do much navigating. Plus, it's useful when I need helping drowning out my internal monologue, which usually goes something like this: "Are we there yet? My feet hurt. I'm hot/cold. Are we there yet? I'm hungry. Are we there yet?"