Tap/Knock code communication

I saw this on the net today and I think it’s a great idea.
Personally I use Morse code, But this limits me in two ways.

1. I need a electronic medium to transmit over great distances.
2. The person receiving the message needs to know Morse code.

With his you could easily use a light or any noise maker.

Here is the Wikipedia page on it.


Here is a link to it over at   Survival Tek   http://survivaltek.com/?p=4617

Or a video by trailkeeper on youtube


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