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GPS stands for global positioning system, and it is used to determine the exact location of a person, vehicle or a receiver in three-dimensional space anywhere on the Earth, and even in orbit about it.
Working
Each GPS satellite transmits data indicating its location and the current time. All GPS satellite have ability synchronize many operations at one time so that these repeating signals are transmitted at the same instant. The signals, moving at the speed of light, arrive at a GPS receiver at slightly different times because some satellites are farther away from each other compared to others. By estimating the time taken for the signals to reach the receiver, the distance from receiver to the GPS satellites can be calculated. When the receiver estimates the distance to at least four GPS satellites, it can calculate its position in three dimensions.
Types of GPS trackers
GPS units come in all shapes and sizes, ranging from compact models designed to be worn on your wrist to large, fixed mount marine models.
Handheld GPS
Handheld GPS is lightweight, portable GPS, designed to be carried and used in the field with a minimum of hassle. Some handheld units come with color screens, while other come in grayscale displays. Handheld GPS available with color screens are easier to read. But at the same time, handheld GPS with colour screen are costlier.
Marine GPS
Marine GPS units come in two varieties -- hand held and fixed mount -- and offer features useful to sailors, power boaters, kayakers, or anyone else that spends time on the water.
Vehicle GPS
GPS in vehicle is used to show direction to the drivers or the people who need guidance while travelling.
To help you keep your eyes on the road, they usually come with voice prompts that give you step-by-step directions to your destination.
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