Sarasota Memorial Health Care System, in conjunction with the technology companies LogicJunction and IndoorAtlas, this week became the first hospital in the United States to offer an indoor way-finding app that uses geomagnetic positioning technology. Unlike global positioning systems (aka GPS) that rely on satellite signals and do not work indoors, the SMH Wayfinder app uses the digital compass and sensors inside smart phones and the magnetic footprint found inside buildings to help people pinpoint their exact location indoors and find their way around the hospital campus. The app, which users can download for free for both Apple and Android devices, provides turn-by-turn directions with an accuracy of three to five feet.