It's cool, but lets keep a few things in mind:<p>1) When navigating a 2d plane, or looking for things in a 2d plane, an overhead view is just as practical. Although you could argue this lets you see data points farther ahead of you, a good overhead view implementation could do the same thing.<p>2) This would be nice viewing differences in elevation. Finding your car in a parking garage for instance. However, GPS has an elevation error rate about 3 times larger than its horizontal rate. (Also most gps's don't work well in things like parking garages). This means you'll only be able to detect the elevation of something within ~30 meters on most phones.<p>Mostly I see this being fun, but not anymore useful than other, more traditional ways of looking at maps. It might prove helpful to people with exceptionally poor spacial thinking (if thats the term you use to describe people who can't read maps, I'm not sure).