Allow me to start this with my personal experience. While serving in Survey and Locating wing, in order to determine the coordinates of a point we used to measure earth with steel tape, solve triangles and relate them to map and so on. Our lives became easy when Global Positioning System (GPS) was inducted. It was fitted in a vehicle and where ever we went the system would give us the exact coordinates of the point. Now GPS has come a very long way. It is being used on land, in air and sea for multi purposes by individuals, commercial concerns and agencies. And now it is available in hand held devices.

Users interested in GPS navigation systems are familiar with Garmin - a well established name in the industry. The latest in a long line of their GSP devices is the GPSMAP 640. This device is an ultra portable and rugged touch screen navigator that helps you find your way through.

GPSMAP 600 series features a high-sensitivity GPS receiver and boasts an intuitive, waterproof (IPX7) super-bright 5.2" WVGA touch screen display (800 x 480 pixels) that reacts as users tap or drag through intuitive menus and options. The GPSMAP 640 comes preloaded with comprehensive street maps of North America and worldwide shaded relief mapping in addition to detailed U.S. coastal BlueChart g2 charts. When placed in its included marine mount, these new portables will automatically start up in marine mode, presenting chart features such as shaded depth contours, port plans, wrecks, restricted areas and more.

"With optional BlueChart g2 Vision™ technology, the GPSMAP 640 provides a true 3-D "mariner's eye view," for a navigation perspective above the waterline, and a "fish eye view" for an underwater 3D bathymetric contour perspective. Mariners will also benefit from the auto guidance technology the g2 Vision data card enables that suggests the best navigational route. In addition, photo references give detailed aerial views of points of interest (POI) such as ports, marinas, waterways and landmarks, reads their press release.

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