This app has been in HTC Sense on some Android phones for quite a while, and now the manufacturer is updating Locations on Windows Phone, too. Pretty neat solution that might save you a few bucks in buying turn by turn voice-guidance navigational software, unless you are clamoring for things like live traffic updates and speed camera lists, of course.
The actual surprise is that it seems to be totally free, like the Drive navigation on Nokia's Lumia Windows Phone handsets. There is a more limited supply of maps, and you can only download US regions for free one by one, and have to pay for the whole of America, but these are very minor quibbles.
We say kudos to HTC for deciding to grace its Mango-ified phone with free voice-guided offline navigation. The Taiwanese definitely seem to be shifting focus back to Windows Phone as well - today we learned that they are urging Microsoft to allow them more flexibility to play around with the interface and further differentiate from the rest of the pack. That's the spirit.