Calculating the location of your mobile device ( the blue dot ) is not as straightforward as you might imagine. It involves databases of wifi hotspots, 3D city models, IMU's, GNSS, your proximity to cell towers, and maybe something called visual positioning.
Ed Parsons - Googles Geospatial Technologist explains 
 
previous podcast episode that you might enjoy!
SATELLITE-BASED AUGMENTATION SYSTEM - A BASE STATION IN THE SKY
POSITIONING AS A SERVICE AND THE ROLE OF SMARTPHONES IN THE FUTURE OF GEOLOCATION
USING THE GEOMAGNETIC FIELD OF BUILDINGS TO NAVIGATE INDOORS
HYPER-ACCURATE INDOOR LOCATION
NAVIGATING THE PAST, PRESENT AND FUTURE OF GNSS
 
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