GPS Chartplotter System

What is GPS?
Global Positioning System . ; Global Positioning System or Global Positioning System is a satellite network that sends the encoded information on a regular basis and by measuring the distance between the satellites around the world makes it possible to identify the exact location .
This system belongs to the U.S. Department of Defense , the continuously rotating satellite in orbit ( from satellites ) occurs. These satellites emit radio signals and GPS receiver receives these signals are on earth . Thus, it is possible to determine the location . Satellite ie full time satellite position and sends information including height and GPS receivers taking place in the world by satellite evaluate this information .
This system was first established objectives entirely for military purposes . GPS receivers to find direction , military decals and is designed to be used in rocket fire . However, in the 1980s, was opened to civilian use of GPS systems . GPS offers a high level of service to meet the needs of both military and civilian . It is free to use satellites .
How does GPS work ?
GPS measuring technology is the basis of the time and position information . Each satellite otomik hours and using their location information continuously emit this information . GPS receiver receives these signals and simultaneously using three or more satellites determines the user's current location on dünyany .
The signals sent and received by satellite by measuring the time between the receiver calculates the distance of the user and the satellite . Information received from at least three satellites calculation algorithm using information reaches the correct position of the GPS receiver . three , two-dimensional information with the information received from satellites ( latitude and longitude) is obtained. I.e. three-dimensional information of latitude , longitude and altitude ) of the four satellites is needed to obtain .
Under normal circumstances, civilian GPS signals to the user precise information about the location data is at least 15 meters . However , DGPS is reduced to 1-3 meters measuring technology kullanılırak DGPS with accuracy , one GPS receiver is placed in a known location and the received information is obtained using the more accurate information .
Also WAAS ( Wide Area Augmentation System) reduces the accuracy of approximately 3 meters below .