b. GPS system provides the most accurate form of navigation.
More about navigation and GPS:
Knowing where a ship, plane, or other vehicle is in relation to a destination is the art and science of navigation. Knowing the vehicle's relative location, or position in relation to other well-known locations, is necessary for navigation.
A navigation system based on satellites is called GPS, or global positioning system. Anyone with a GPS receiver can utilise the system, which is sponsored and managed by the U.S. government's Department of Defense.
Using the time it takes for the signal to broadcast and the precise location of the satellites, a GPS device gets a signal from the satellites and uses that information to determine its location. It is a very precise navigational aid.
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