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GPS Screen SizeDedicated car GPS device screens used to come in two sizes: 3.5 inches (diagonal) and 4.3 inches. I have long advocated spending just a little more for the 4.3-inch screen size, because that precious extra screen real estate makes a significant difference in visibility and ease of use of touchscreen controls. But thanks in part to competition from smartphones, and the desire on the part of GPS makers to differentiate their products in an increasingly competitive market, larger screens are becoming much more common. Screens in the 5-inch size used to be rarities, but now all of the big manufacturers have at least a few models. And some manufacturers, such as Magellan, have ventured into behemoth screen territory with 7-inch screens. Read on for more about how to select the right GPS screen size for your needs. Image Magellan, Garmin

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