Indoor Navigation System offers economic advantages in localizing advertisements, personalized coupons, vendors delivering content at the right time and place and in-store mobile marketing. Several approaches that play a significant role include - The coverage of the area with various sensor types, exploiting radio signals, modulated infrared lights, perturbations of the earth's magnetic fields, ultrasounds. Here is a brief on the process, technologies, benefits, use cases, accuracy and cost of indoor GPS positioning applications.