http://www.readwriteweb.com/archives/6-navigation-apps-that-go-the-extra-mile.php
and
http://gizmodo.com/5656790/the-best-navigation-apps
are both websites that had what they believed were the best narration apps around for smart phones and tablets, these apps were designed to help the user to get from one place to another, some tell you the fastest route and others give an update on what is happening on the road so helps you to choose the most efficient route to take to avoid things like road works, traffic or cop stops.
from this I went and found videos on some of the apps, to see how they tried to sell there product:
I also looked google maps an iPhone as it is the most common navigation app around
I found that google maps was easy to use with the use of gestures to move around and zoom in and out. Also it had different settings which the user can choose to depend on their preference. I also liked their graphics it the way that it gave the sense that the page lifted up to change the settings. the last thing that I liked about google maps was the fact that if you have your internet on it can work out were you are and find you the best route yo take form your current location.
I also found a website that had invented a way to help people find there way through a building http://www.mobilemag.com/2012/05/07/indoor-sensor-allows-navigation-inside-buildings/
this way people can find there way through building on different levels.