A few basic questions. What OS are you running? Official from YOUR carrier, official from another carrier or a LEAK?
What gps apps have you tried? How far off are you? Does your phone have a clear view of the sky - they generally don't work well inside of structures like parking garages. I don't know how well or even if the gps in the z10 is assisted by cell towers.
I'm running the official 10.2.0.429 from Bell Mobility from Toronto. TimmyApp, MAKE and BlackBerry Map are just examples of the apps I tried. They all used to be pin point accuracy on my location. One time it says I'm on the other side of the city.
I rebooted and TimmyMe is only one of 3 I mentioned above that isn't pin point accurate. I wonder if it just a delay on that sensor server calibration. Hmmm