Be careful with GPS

Global positioning system (GPS) receivers have silently invaded our industry. For as little as $150, geologists, engineers, and well supervisors can now accurately map surface features, survey pipe- line corridors, spot drilling rigs, and track the passage of crude around the world. Click here to enlarge imageBut to better appreciate its capabilities and avoid costly mistakes that may result in incorrect maps and misplaced assets, we need to understand the system's limitations, the ways in which GPS coordinates, and how elevation readings may be confused with traditional mapping systems.Satellite navigationGPS, otherwise known as NAVSTAR (Navigation System with Time and Ranging), is ...

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