One solution is to just buy Sygic (the whole company or just the app) and offer it for free.
However, they [Nokia] don't need to buy Sygic for that, they already bought NAVTEQ, who makes excellent maps and software for navigation devices.
does sygic offers something similar to "street view" from google?
Does the voice announce the street name?? Another question: Does this app require internet to run and download map on the fly?