by Selyna D.
New technologies are introduced into the market every day, and some of the most advanced items available today are Global Positioning System (GPS) receivers. The GPS helps people locate their precise positions on the globe, find other points of interest, and get directions between locations. Many manufacturers have begun building and offering receivers, but one of the clear standouts is the discount Garmin nuvi 760 GPS receiver.
The GPS consists of satellites and receivers. The 24 satellites send signals to the receivers on the ground, which calculate their own locations (with an average accuracy of within 15 meters). To plot a two-dimensional location (latitude and longitude), the receiver needs to be able to read signals from three satellites. With the information from four or more satellites, a three-dimensional location can be determined.
The U.S. military originally placed the 24 GPS satellites into orbit to assist with military operations around the world. The system was offered for civilian use in the 1980s (without cost). Today, various companies manufacture a wide range of GPS receiver units that are used in conjunction with the satellites to help everyday people pinpoint their own locations. Some units, like the discount Garmin nuvi 760 GPS, also have the ability to perform many other functions.
The satellites that make up the GPS make a complete orbit around the earth twice each day. Each travels a path that has been carefully plotted to enable the system to provide complete global coverage. While they travel, they send signals to the ground. The signals travel via a line of sight. This means that they can pass through things like glass and clouds, but not through solid objects like mountains or buildings.
The GPS receiver constantly picks up the signals sent by the satellites. It then compares the time it receives the signal to the time the signal was transmitted by a particular satellite. This tells the GPS receiver how far it is from the satellite. Knowing how fast the satellites are traveling (about 7,000 miles per hour), the receiver then calculates its position between itself and the three or more satellites.
Once the group of satellites and the receiver have calculated the receiver’s precise location, they can also determine other things helpful to the user. These include the user’s distance from their destination, time to destination, speed, and bearing. The discount Garmin nuvi 760 GPS is one receiver that can perform not only these functions, but others as well.
The GPS satellites function 24 hours a day in all weather conditions and in all countries around the world. They travel in an orbit approximately 12,000 miles above the earth and operate on solar power with backup battery power. Small rocket boosters are attached to each satellite to keep it on the correct orbital path.
Although the satellites function 24 hours a day, the calculations performed by the receivers can be affected by some unusual occurrences. If a satellite signal bounces off of a building or other solid object, the time it takes to reach the receiver is lengthened. This affects the calculations the receiver makes to determine how far it is from the satellite. Another thing that can make calculations imprecise is the fact that the atomic clocks on the satellites and the less advanced clocks on receivers do not always read the same time. In these cases, the calculations are also negatively affected.
The discount Garmin nuvi 760 GPS receiver has twelve parallel receiving channels, which allows it to calculate precise information easily. With twelve channels, the unit reads multiple satellite signals simultaneously, allowing it to quickly determine the user’s location. They also make it easier for the unit to stay connected to satellite signals in challenging areas like cities with skyscrapers or areas dense with tall trees.
GPS technology is certain to retain its popularity, and perhaps even to gain more popularity in the coming years. As the technology continues to evolve, GPS units will become more advanced as well, and new uses for it will be found. Stay tuned to see what happens next.
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