What is Echolocation? How is it Possible for humans to echolocate like Bats?

Echolocation:

Some animals like bats and dolphines use sound to see their surroundings. This is called echolocation. They make sounds around the surroundings and these may bounce off when they hit some objects and reach back the sender. Their brains actually able to translate the reflections of those sounds into a kind of 3D picture. Humans can also echolocate. Normally the people who are visually challenged can echolocate and it helps them navigate what they can't see. By making clicking noises and listening to the reflected sound waves, they are able to obtain information about the size, shape and texture of the objects as well as the distance from them. That allows them to built a mental map of their surroundings. The clicks are higher in frequency than the normal speech. Bats emit low frequency waves to predict prey and when they found it they use high frequency waves for the accurate determination of the prey. Even normal people can learn to echolocate but it takes time and not everyone who is tried is great in it. In 2011, a technique called Functional Magnetic Resonance Imaging which monitors the blood flow to see the brain activity in real time. Using FMRI, they conduct a test with 2 normal persons and 2 visually challenged persons using echolocaters. One who lost vision by infancy and another who lasts vision in teenage. It may be seen that the parts of their brain normally used for visual processing were active during echolocation. There is a very small limited research is going on echolocation, hence some questions is still unknown. The factor that any people can echolcate at all shows just how adaptable their brains really are.