It's Sirf Star III, it'll work anywhere. I have mine inside the fan shroud stuck to a piece of metal in there. There's a magnet in the 213 so it sticks (VERY WELL) to any metal around it. I put it on the side of my desk and needed 2 hands to get it off. I just popped the vent off, put it inside and put the vent back on. Nobody can see it.
You also asked how I find it in urban areas with dense foliage. I just used this last month to drive about 9000 kilometers from Calgary, Alberta to Atlanta, Georgia and never had a problem with it anywhere. It's bulletproof.