It may feel like you are always on the grid and your location is constantly broadcast by some GPS device or another. In reality, we are often in environments, including buildings and parking lots, where GPS works poorly or not at all. 

Behavioral analytics was originally conceived to extrapolate online users trends (e.g., navigation paths and clicks) and to tailor marketing efforts accordingly. More recently, there has been a growing interest in active tracking systems that can analyze the behavior of people and things in public spaces, through dedicated infrastructures or by relying on people's personal devices. This approach has privacy, device and cost issues. 

In fact, business intelligence often requires monitoring the flow of people to figure out which exhibits at a museum are most popular, which areas of a building get the most use, or which part of a store receives the most traffic.