However, it is important in any modern discussion of accuracy of these devices to talk about overall GNSS accuracy because many devices use multiple GNSS systems at the same time to improve coverage and accuracy. GPS was the first GNSS constellation which is why the terms "GPS" and "GNSS" are often used interchangeably.
GPS (the Global Positioning System) is a GNSS constellation, but GNSS is not always GPS since there are four different GNSS constellations: GPS (United States), GLONASS (Russia), Galileo (Europe), and BeiDou (China). A Global Navigation Satellite System (GNSS) is a group or constellation of satellites providing signals from space that transmit positioning and timing data to GNSS receivers. The Sentinel satellites are equipped with multi-spectral cameras, enabling the monitoring of algae blooms, vegetation, soil moisture, and the detection of phenomena such as ground movements of a few millimetres, even through the thickest cloud cover. There are currently seven Sentinel satellites in orbit, flying at different altitudes up to 824 km which is twice as high as the International Space Station. Copernicus satellites are called “Sentinel”, just like a guard their job is to stand and keep watch. The Copernicus programme was named after Nicolaus Copernicus, a Polish mathematician and astronomer who changed our understanding of the Earth and the universe by demonstrating that the Earth rotates around the Sun and not vice versa. 
While satellites are the Copernicus superstars, the in situ component includes ground-based, sea-borne or air-borne monitoring systems deploying a battalion of mammals carrying small sensors to better protect endangered species and our planet in general!.
Producing over 16 Terabyte per day, Copernicus is the largest space data provider in the world.It is estimated that every €1 invested in Copernicus generates up to €10 in return.
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