The idea is to have a SIGHTSEEING MODE , that you can choose when your using navigation. As you are driving / walking / biking etc. through a area this mode will tell you out load any interesting points about the area you are passing .
For instance we just did a family road trip through Iceland . We would have loved for navigation to talk to us as we pass cool places , Like "To your right a glacier called ... it is 700 miles long and in 1984 it melted and flooded this entire are etc.
The technology is there , you have navigation / GPS / and Google has all info on "Points of interest"
All the best !
Please contact me if you are interested in this.