I have tom-tom on my phone. It is a very slick and proffessional sat nav, with all the features of a dedicated satnav. Google maps offers something different, you can tap on points on the map and it will bring up a 360 panorama taken at that point. Or you can tap on any business or venue and it will bring up details and reviews. It can also show you location of your freinds phones. It's full of different features than a sat nav, although I believe the android version has a fully functioning sat nav. Dont be misled by the fact that it's free, it is a flagship app for the android system, it's superior to anything i've seen on the iPhone.