GPS is a satellite based global positioning device (satellite device) that can track people and places and plot points on maps. It can be used as a navigational tool to help plot directions to a coordinate specified by geographical location.
GPS on mobile phones is a combination of two technologies. The mobile phone is now capable of hosting all sorts of software and is compatible with all sorts of hardware also. Most new phones and certainly new smart phones contain GPS readers. This means that whilst this reader is turned on your position can be constantly logged and a destination also can be specified. A web based tool such as Google maps can be used harmonise these positions and create directions available visually in the palm of your hand.
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