In my driving world that translates as being useless. Without routing directions, it can make it quite dangerous if you are constantly just looking at a map without any feedback from audio or quick glances at visual guided directions especially in this fast paced world where even something simple as blinking on the road at the wrong moment can have huge consequences. Maximum concentration is needed under the best of circumstances, so needing to keep looking at a map while using manual directions can open up a whole can of worms on a safety level. Tried doing it the manual way, hated it, bought the Wayfinder software and feel safer while driving. If the term useless is too harsh, then I'll change it to extremely limited and rather risky while driving without using routing software.