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A Communication And Navigaiton Venture

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Garmin

NAVIGATORS

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GPS and digital-mapping technology have combined to make an evolutionary leap. These portable navigation systems can help you get from point A to point B with audible driving directions, color maps, points of interest, and much more.

Before we dive into the types of navigation systems and buying advice, it's always good to get a little background on the technology and have a basic understanding of how it works. Originally developed in 1973 by the U.S. Department of Defense for military purposes,

The NAVSTAR GPS network consists of 30 satellites orbiting the earth every 12 hours, and five ground stations that monitor the satellites' position in space and operational status. To determine your location and other data accurately, such as current and average speed, directional heading, and elevation, GPS devices use a receiver to acquire signals from at least four of these satellites. This is known as a 3D fix and it's why GPS antennas require an unobstructed view of the sky to work correctly.

Armed with your precise latitude, longitude, and other location data, the GPS receiver can overlay this information onto map files stored on the unit, revealing your current position on the map as well as where you've been. Since the receiver is constantly recalculating your position relative to the satellite's position, the GPS unit can track your location in real time. A typical GPS device contains a 12-channel receiver and an antenna to capture satellite signals, and a CPU to process the data. The quality of the receiver and your geographic location will determine how long it takes the device to acquire a 3D fix.

 
 

HANDHELD GPS

OREGON 550

GPS has applications beyond navigation and location determination. GPS can be used for cartography, forestry, mineral exploration, wildlife habitation management, monitoring the movement of people and things and bringing precise timing to the world.

The GPS satellites continuously transmit digital radio signals that

contain data on the satellites location and the exact time to the earth-bound receivers. The satellites are equipped with atomic clocks that are precise to within a billionth of a second. Based on this information the receivers know how long it takes for the signal to reach the receiver on earth. As each signal travels at the speed of light, the longer it takes the receiver to get the signal, the farther away the satellite is. By knowing how far away a satellite is, the receiver knows that it is located somewhere on the surface of an imaginary sphere centered at the satellite. By using three satellites, GPS can calculate the longitude and latitude of the receiver based on where the three spheres intersect. By using four satellites, GPS can also determine altitude.

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Vehicle Tracking System

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A vehicle tracking system is an electronic device installed in a vehicle to enable the owner or a third party to track the vehicle's location.

Most modern vehicle tracking systems use Global Positioning System (GPS) modules for accurate location of the vehicle. Many systems also combine a communications component such as cellular or satellite transmitters to communicate the vehicle�s location to a remote user. Vehicle information can be viewed on electronic maps via the Internet or specialized software. Vehicle tracking systems are commonly used by fleet operators for fleet management functions such as routing, dispatch, on-board information and security. Other applications include monitoring driving behavior, such as an employer of an employee, or a parent with a teen driver. Vehicle tracking systems are also popular in consumer vehicles as a theft prevention and retrieval device. Police can simply follow the signal emitted by the tracking system and locate the stolen vehicle. When used as a security system, a Vehicle Tracking System may serve as either an addition to or replacement for a traditional Car alarm.

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