Introduction--What Is GPS?
http://www.lowrance.com/en/Support/Tips-and-Tutorials/

Lowrance Electronics Inc.


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This Global Positioning System (GPS) tutorial from Lowrance Electronics introduces GPS and discusses position determination, GPS accuracy, differential GPS, and Wide Area Augmentation System. There are also links to other tutorials, products and utilities.

This resource is referenced here:
Subject: Geography:Geospatial
Resource Type: Pedagogic Resources:Overview/Summary, Datasets and Tools:Tools