I spent the day driving around in a roughly 25 miles radius, to put the gps of the device to the test. I used google maps as it came pre-installed on the phone and this was my first full day with it.
Gps works as a gps, and functions even with wireless and cellular service disabled. (duh, but had to check it wasn't getting location via 4G)
Worked extremely well, and the radius to my location only raised above 10 meters a few times. Generally speaking I feel comfortable in saying it'll peg the phone to 10 meters through gps alone pretty consistently.
This was at speed in a vehicle, and on foot through parking lots and such. Even though it said to within 10 meters, I found that on foot it pegged the phone to about 3 feet. (1 meter) I could tell this by coming to and crossing roads marked on the map, and being zoomed in gauging how far that road actually was in front of me)
Using GPS only for location services, I lost reception whenever I entered a building, but sometimes it would find it again. Some of the buildings I walked into have enough electrical interference that cell phones don't get reception, so it was a good run of places to test it.
I got a handful of errands run in the process, so it was a pretty win situation.
For an out of the box solution, i'm impressed. It did much better then my year and a half old bottom of the line garmin nuvi 255w. Granted I bought that as the cheapest one I could find at the time, so it's no surprise this phone has a much more advanced gps functionality.
One of the reasons I purchased this device was to replace my GPS. When I bought the GPS unit I wasn't sure it would be worth the money at the time. Since then i've capitalized on having it by getting a job that entails a lot of running around to different locations, and a GPS unit is a necessity for the work. I've been looking to get a better GPS unit then a low end model for a while now.
I'm definitely on the lookout for other GPS capable map apps to use for navigation - what's better and why?