Locating something is always painful. If the area covers the entire earth, you can imagine. To make life simpler, satellite based positioning systems provide location information at various accuracy levels based on the requirement.
For the casual user, standalone GNSS systems provide location with a horizontal error of about than 10 mts. The professional users can use GNSS systems augmented by satellite based correction signals, providing and accuracy of about 2 mts. And for the critical needs like surveying etc., one can use DGNSS systems providing a position accurate to sub-centimeter level.
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