On our present tour we use everything we have; phones, gps, netbook, and the excellent Michelin maps. Our route finding on this trip has been exceptionally complex. Part of our route took us down through Poland and into the Czech Republic. We pretty much stay off the established cycle routes, and plan as we go.

FWIW, don't rely solely on Google maps without some other means of confirming information, unless you really enjoy adventures. Yesterday coming into Prague, we ended up on on a muddy road that ended at a long set of stairs leading to the road we wanted.