Classifier Instance:

Anchor text: Global Positioning System
Target Entity: Global_Positioning_System
Preceding Context:
Succeeding Context: (GPS) receivers can also determine altitude by trilateration with four or more satellites. In aircraft, altitude determined using autonomous GPS is not precise or accurate enough to supersede the pressure altimeter without using some method of augmentation. In hiking and climbing, it is not uncommon to find that the altitude measured by GPS is off by as much as a thousand meters, if all the available satellites happen to be close to the horizon.
Paragraph Title: Global Positioning System
Source Page: Altimeter

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