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The Garmin nüvi Pocket Guide, Second Edition by Jason D. O’Grady

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7. Map Updates

For all the technology orbiting over our heads, the GPS satellite constellation provides two simple pieces of data to your nüvi: your current coordinates in longitude and latitude. (It actually provides a third piece of data, altitude, but let’s not split hairs.) The nüvi uses this information to plot your location on a map and then uses the map data installed on the GPS unit to determine a route.

Since map data isn’t updated via satellite and is a critical part of navigation, it’s important that you keep your map data current.

The heart and soul of the nüvi is its maps database. While points of interest (POIs) are nice, most people buy a GPS receiver for its ability to use maps to get them from here to there. Given that, ...

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