IPhone 3G includes a navigation tool.
In addition to other features -LRB- including push email and turn-by-turn navigation -RRB- , this new operating system introduced the App StoreApple 's new distribution platform for third-party applications .	push email	push email	turn-by-turn navigation	turn-by-turn navigation
Turn-by-turn navigation is a feature of some GPS navigation devices where directions for a selected route are continually presented to the user in the form of spoken and visual instructions .
