Not when the mains power is out or no mobile networks. Try turning off the data connection and seeing how well the mapping/routeplanning works then. There are a few apps that have offline maps but the ones supplied with phones are nearly always online. Sheeple don't care how things work or what is required for them to work, they just accept the "magic".
And even if you have a data connection is that "clear" bit of road really clear or no data as the power has gone in that area?