Can humans really navigate via echolocation?

Senses in the news:

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Oops, I see that I wasn't the first to think of that connection. Should have checked the hyperlinks before commenting.

A friend of mine lost his eyes to cancer at the age of three. A few years later, he was cycling slowly around his area on ecolocation. Now he's a radio journalist.

Another blog was discussing whether or not there might be some sort of relation between the clicking sounds in Khoisan languages and this ability to navigate using echolocation. The Khoisan people live in a very open, dry part of Africa today, but long ago the area they inhabited was probably more heavily forested. It seems like a long-shot but echolocation might have come in handy.

Yeah, that is really impressive, though I'd like to see some scientists taking a good look at what that kid does (it'd be interesting to see how much of his visual cortex has been taken over by his auditory system, too).

And the paper on cogprints is more than iffy.