Don Bartlett, in association with National Resources Canada, has developed an educational instruction manual addressing many key elements of GPS units. First he describes the basic features a buyer should consider when purchasing a handheld unit. Bartlett then discusses in detail the limitations and the accuracies of the readings collected by a GPS unit. Users can learn how GPS systems work and how the readings correspond to map coordinates. The site also discusses many features of a GPS unit such as storing points of interest (waypoints) and tracking routes. Because of the difficulty many people have in understanding UTM (Universal Transverse Mercator grid), Bartlett explains in detail the coordinate system. This site is extremely beneficial for "hikers, fishermen, hunters and all persons who wish to traverse the wilderness in the full knowledge of where they are, where they have been and where they wish to go." This site is also reviewed in the August 22, 2003 NSDL Physical Sciences Report.
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