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2. What data is sent from GPS satellites to receivers?

   gis.stackexchange.com/questions/179

   Each satellite is sending exact (atomic) time, and GPS receiver calculates thanks to it, it's position. There is also some additional data, like position of satellite (almanac) which is also required to perform calculations, and a few minor things.

3. Why does GPS positioning require four satellites?

   gis.stackexchange.com/questions/12866

   29. You need four satellites because each data from one satellite put you in a sphere around the satellite. By computing the intersections you can narrow the possibilities to a single point. Two satellites intersection places you on a circle. (all points possible) Three satellites intersection places you on two possible points.

4. Is GPS more accurate on specific hours of the day?

   gis.stackexchange.com/questions/181

   NAVCOM GPS Satellite Predictor Tool. Great tool if you require a certain level of (x)DOP for GPS Data Collection, to prevent spending an entire day in the field due to poor (x)DOP of GPS Satellites. Of course this tool can not calculate other external factors which will affect (x)DOP.

5. satellite - Why is GPS a free service? - Geographic Information...

   gis.stackexchange.com/questions/17535

   37. The Global Positioning System (GPS) is a free service that is owned and operated by the U.S. Government and is always available. When we buy a GPS device, we don't pay a monthly fee or pay a tax for GPS support. We only pay the price of the device.

6. gps - Satellite data to position coordinates - Geographic...

   gis.stackexchange.com/questions/286398

   In order to be answered, questions need to show an appropriate level of research, and an attempt to solve the problem. All questions should specify the GIS software in use. What've looked at so far was taking the raw satellite data and trying to find how a GPS converts them to coords.

7. Determining GPS Position from Elevation, Azimuth, SNR

   gis.stackexchange.com/questions/220210

   This gentleman here can compute the location of a GPS satellite given receivers location, satellite elevation and azimuth. I want to merely do the reverse, given satellite location (from almanac), azimuth and elevation, compute receiver's location. Another link on azimuth / elevation and Android.