Definition:
A satellite based navigational system allowing the determination of any point on the earth’s surface with a high degree of accuracy given a suitable GPS receiver. The network of satellites is owned by the US Department of Defence, and as such, the accuracy of the signal is intentionally degraded for non-US military users. The error introduced into the signal is known as selective availability. Error in the accuracy of GPS derived positions can also be introduced through the nature of local conditions, for example multi-path. These errors can be greatly reduced using a technique known as differential GPS.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO. 1999. Terminology for integrated resources planning and management. By: Choudhury, K.