Mapping is hot these days. We wrote about the Apple iOS maps a few weeks ago, and even more recently Google and Toyota teamed up to give even the smallest roads in Brussels the Streetview treatment. Next up? Interiors. While Google might be photographing these to even further bolster its map offering, a team of Finnish researchers is going one step further by using the earth's magnetic field to help map and navigate interior spaces using the built-in compass on your phone. The technology is an offshoot of a university research project, but the developers are already planning on monetizing it by selling the technology and releasing an API. We're excited about the implications of this for retailers and marketers. Not only will it help indoor spaces (think big-box stores, malls and train stations) provide more accurate directions, but the technology also helps open the door to location-based promotions or advertisements. Learn more at IndoorAtlas.com