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The ultrasound reflections are then picked up and evaluated by a two channel receiver.
.
The blind person is then able to listen to these sounds through earphones. They can also determine how far away the object is as well as its size once they have mastered the technology.
amazing how technoloogy can improve the lives of those less fortunate It has been so succesfull that the individual can also interopret several objects around them and navigate through them

Thanks for taking the trouble to look this up Ods; Isn't it amazing where technology
is taking us!

There is also this article I found interesting about a revolutionary walking cane that
does something similar.

'Batcane' link

It is amazing! wow what an interesting article, thanks

Awesome stuff - and so great for visually challenged people! Tx for great info, S & Ods.

As a rule fruit bats (Eidolon helvum) roost about a wingspread apart from one another.
However, there is an event that takes place every year in southern Africa that causes this
to change, and the bats are said to roost so distinctively, that "from a distance they look
like swarms of honeybees, their densely packed brown bodies hanging from every bole and
branch of every tree and even from one another." What event is this, and where does it
take place?

I found this:

Good answer Imberbe! Close, I'm looking for a larger annual migration.

Was a great Q ... what's the answer, Siobain? Please.

Are you thinking of the annual gathering next to the Musola river in the Kasanka national park in Zambia?

They arrive from the Congo in time for the rainy season, due to the huge numbers of fruit available in the area. They weigh approx. 700 gram each ... but are known to break tree branches, because of the numbers congregating in the sleeping areas.

WEG Magazine March 2010 has a nice article.

Thanks Imberbe, yes the arrival of the bats to Zambia's Kasanka National Park usually in October.

Known as one of the great wildlife wonders, it is said that up to 8,000,000 Fruit Bats arrive.
a truly spectacular occurrence, here is the LINK

Wonderful Q, Siobain. Fascinating stuff - must be a sight to savour!

Well done, Imberbe.