Which smartphone app is the best for GPS navigation (driving only)? You may want to consider whether the software is free, whether data connection is required on the road, whether a lot of disk space is required to save the maps, how accurate the maps are, and so on.Navfree is completely free, but the open street maps it uses are not detailed enough to always take you to the right place.Google Map Navigation requires data connection. However, you can avoid or minimize using data connection on the road if you pre-download pieces of maps (20x20 square miles each) prior to your trip using WIFI.AndNav2 and Mapquest required data connection to me while Sygic is a paid service.What have you found and liked the most?