“Since the advent of the time, navigators and explorers have looked to the heavens for a system that would help them determine their positions on Earth. Today, the Global Positioning System (GPS) lets you know your precise location, so you’ll never get lost.”
GPS stands for Global Positioning System. It was originally made from US government and used for US military applications but in the 1980s the government allowed civilian to use the GPS system. GPS comprises several satellite systems that used to compute positions all over the world. It is extremely accurate where GPS receiver locates 4~ more satellites and calculate the distance between each satellite therefore the GPS receiver can use the information to determine its own location; the above operation is based on simple mathematical principle called “Trilateration”. Once the calculation results are made, the GPS receiver will retrieve the figures and display it to the user as latitude, longitude and altitude (coordinate system) from its existing position.
GPS receiver features:
- Developed into various formats/outlook, the GPS receiver can be integrated into vehicles, mobile phones, or other handheld devices etc.
- It can receive signals from the satellite but it cannot transmit or send signals.
- The electronic maps are stored in the receiver’s memory. A typical GPS will not only retrieve your location on the map, but will also trace your path across the map, showing you how your location is changing as you move
- It also provides the following information:
- Longitude, latitude and altitude
- Time spent
- Current speed (if installed in vehicles)
- Average speed (if installed in vehicles)
- Showing the history route where you have traveled
- The distance to destination
- Sunrise & sunset time
- Weather broadcast (if integrated with wireless service/ granted access to the Internet)
- Height of existing location