An article in Spiegel Online International describes one subject, a young girl, who is able to negotiate strange places through the use of echoes at a very early age. When she was crawling, she would slap her hands down on the floor and listen for reverberations. In later years, she used a sharp callout or tongue click to determine whether she was in a stairway, subway station or store. Her mother reports that new places have become exciting to her.
Daniel Kish, a California native and pioneer in echolocation for the blind who goes by the nickname “Batman,” estimates that 500 blind people and 5,000 teachers from 18 countries have undergone the training. Some people become so proficient that they are able to play contact sports, such as basketball. Some believe that a person well-practiced in flash sonar could determine their proximity to train stations, kiosks and parked cars.