GPS signals are relatively weak and easy to jam.

GPS信号相对较弱，也易于阻塞。

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The goal of Wikiloc is to help you share and discover GPS tracks and waypoints from around the World in an easy way.

Wikiloc的目标，是帮助您用简单的方法分享和发现来自世界各地的GPS轨迹和锚点。

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Next was a library that made it easy to do distance calculations from GPS coordinates.

然后是能够帮助根据GPS坐标计算距离的库。

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"GPS is an easy, last-minute gift, especially if you're concerned about whether people have it or not, " Baker says.

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The Magellan eXplorist 510 Marine Edition provides boaters with a custom selection of best-in-class Navionics marine navigation charts and data plus a rugged, waterproof handheld Magellan eXplorist 510 Outdoor GPS device featuring easy-to-use menus, a built-in camera and a 3-inch sunlight-readable color touchscreen.

ENGADGET: Magellan eXplorist 510 Marine Edition sets sights on boaters, out in time for Talk Like a Pirate Day

Faculty at the University of Georgia have invented an easy-to-use, GPS-based technology that allows farmers to more accurately target irrigation needs, reducing water consumption by an average of 15 percent.

FORBES: New Technology Reduces Agricultural Water Consumption