At the present time, the convenience of transportation enables us to get to more places with a faster speed. However, we are more likely to get lost in the journey in the meanwhile, which leads to the advent of GPS navigation in our life. After the development of years, GPS has become a usual concept for people, and various applications have been widely used in many occasions like vehicles, ships and planes.
When we go out for a journey, long or short, a GPS unit is helpful for guidance of direction. Today, a GPS system can be built in many electronic devices like watches, cell phones and car DVD players. When we fail to find a right route to our destination, we can access the navigation system simply by pressing or touching a button, and then it will show us an accurate direction and exact information of location. Hence we don’t have to move round and round in the same place without getting a route.
Many people may be quite familiar with GPS navigation units. However, do you know how such a unit works so well? The GPS system is a space-based global navigation satellite system which consists of a network of 24 satellites placed into the orbit by the US Department of Defense. It can offer information of time and location in any weather anytime and anywhere, as long as there is an unobstructed line of sight to no less than 4 GPS satellites.
Every day, the satellites go around the earth twice in a precise orbit. Then GPS receivers get the signal information from the satellites and calculate a location by triangulation. After comparing the time a signal was transmitted by satellites with that the signal was received, the distance from the GPS receiver to the satellites can be measured so that the user’s exact location can be determined. The useful GPS navigation was first used in ships, and now there are kinds of applications in our life available for outdoor activities such as hiking.
Car GPS is one of the helpful applications. The car GPS system can be installed in the car DVD system, or it can be built in an external SD card. A digital in dash monitor is used to display an electronic map clearly as well as necessary information of time, location, and nearest gas stations, etc. With such car navigation, you don’t have to worry about whether you will lose your direction anytime in the journey.
With excellent navigation function, a GPS unit has become a must in every journey that people enjoy, whether it is an auto GPS or handheld GPS. No matter where you go, it can be a wonderful companion guiding your direction.
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