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An explanation of the Global Positioning System (GPS) and the Geographic Information System (GIS) is given in this presentation. Uses and applications are considered. How it works and sources of error are also touched upon. A large portion of this slide show provides step-by-step instruction for using the handheld GPS, Garmin eTrex®. If you are not using the device, skip to the 39th slide to learn about topographic maps.
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