The 2015 nav displays the name of the road you're currently on (but only if you're on a road) in a box at the bottom of the screen. If you tap that box, it brings up a screen showing elevation and approximate numbered addresses for each side of the road. Under good conditions, I've observed an accuracy of roughly +/- 100 feet. Don't use it much so not sure how reliable it really is.
I've always found my little analog barometer to be sufficiently accurate when hiking (comparing with a topo). The only thing that could throw it off would be a significant weather event, but not likely more than a few hundred feet over the course of a day, and a typical hike offers multiple opportunities to re-calibrate at known locations. I don't generally use GPS, but have observed them struggling for just a 2D position in certain types of terrain and/or vegetation.