With GPS apps for your smartphone, it’s no longer necessary to buy a full-fledged GPS device. Most of these apps are free, and some of the lesser-known ones, like Waze and MapQuest, have unique features that are worth considering.

Here we look at four of the best turn-by-turn navigation apps for Android and iOS devices.

Apple Maps got off to a rocky start when it first launched in 2012, with many inaccuracies and inconsistencies in its database. Apple has since poured massive resources into its default GPS navigation app, dethroning Google as the primary service for iOS devices.

Unlike Google Maps, it is not available for Android OS smartphones and other devices. Features include a Look Around function for exploring cities in a 3D environment; real-time public transit data; and spoken turn-by-turn directions that rely on landmarks and objects instead of just street names.