NavList:

What people might be looking for is backup navigation, not exactly emergency nav like Tom Sult was suggesting, but something one or 2 steps up from that.  Lets say you are crossing the Atlantic and Pacific, what would you carry as a backup to GPS that minimized cost and storage space, how to use those resources you brought and how to stay in some semblance of practice and how to keep your time pieces accurate.  The goal being to continue the cruise to the next major port for repairs without experiencing major pucker factor until then.