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I would recommend the TatukGIS viewer that Jaime mentionned. I has a free version that supports a very wide variety of vector and raster formats. It is also quite easy to use.<br />
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Albert Godfrind<br />

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What are the best free or inexpensive GIS viewers ?
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What are the best free or inexpensive GIS viewers ?

Best GIS viewers

The Global Positioning System (GPS) is a space-based global navigation satellite system (GNSS) that provides reliable location and time information in all weather and at all times and anywhere on or near the Earth when and where there is an unobstructed line of sight to four or more GPS satellites. A geographic information system (GIS) or geospatial information system is any system that captures, stores, analyzes, manages, and presents data that are linked to location(s). In the simplest terms, GIS is the merging of cartography, statistical analysis, and database technology.