Differential GPS doesn't work indoors, I thought? The main problem is that wireless signals simply aren't reliable. You could "boost" GPS indoors, but that doe

Differential GPS doesn't work indoors, I thought? The main problem is that wireless signals simply aren't reliable. You could "boost" GPS indoors, but that doesn't get around the fact that there are corners, concrete walls, mirrors, humans, and so on. Anyway, we're splitting hairs. The point is that we don't currently have an IPS. It doesn't matter if we extend GPS to work indoors or use other signals to create an IPS -- the point is, we need to create an IPS :)