Does GPS Navigator send data to satellite?
Is this true about regular devises available in the market?
[GIS] Does GPS Navigator send data to Satellite
gpsnavigationsatellite
Related Solutions
Just a graphic to add to M'vy's answer.
From Geocommons:
This is
a high-tech version of triangulation,called trilateration. The first satellite locates you somewhere on a sphere (top left of Figure). The second satellite narrows your location to a circle created by the intersection of the two satellite spheres (top right). The third satellite reduces the choice to two possible points (bottom left). Finally, the forth satellite helps calculate a timing and location correction and selects one of the remaining two points as your position (bottom right).
Update
As R.K. points out, this is not a form of triangulation. Even when GPS is leveraging more than 4 satellites, it is still doing trilateration, as opposed to multilateration, which GPS does not use.
Multilateration should not be confused with trilateration, which uses distances or absolute measurements of time-of-flight from three or more sites, or with triangulation, which uses the measurement of absolute angles. Both of these systems are also commonly used with radio navigation systems; trilateration is the basis of GPS.
Is the GNSS receiver providing NMEA data? If so, is the GSV sentence provided? If so, the elevation in degrees is provided in that specific sentence.
Best Answer
GPS receivers do not transmit any information they are built for receiving information. The encompassing device then uses said information depending on what the device was built for.
You would be hard pressed to find a 'regular device' on the market which transmits data back to 'the satellites'. 'Talking' to 'the satellites' is not a necessary part of GPS functionality.
As was mentioned in the comments, the devices in question can relay information that has been captured if there is a method to do so on board. For example, smartphones and other tablets have the ability to communicate over 3/4G and WiFi. In most instances, however, you must authorize the device to send this information due to privacy laws.