What is DGPS (differential GPS)?

A Differential Global Positioning System (DGPS) is an upgrade to the Global Positioning System (GPS) which gives further developed area precision, in the range of operations of each framework, from the 15-metre nominal GPS accuracy to about 1–3 centimetres in case of the best executions. Differential GPS includes the collaboration of two receivers, one that’s stationary and another that’s roving around making position estimations.