Hoseless Computers atrracting sharks

[Rick Inman]

Leaving an uber-race of smug cyber divers?

Can't get bit by a predator on-line.

-Oh, wait a minute. I think I just did!

 

[gchapman]

Hi,
I've talked to several people who have given annecdotal evidence that sharks (other potentially dangerous critters) are somehow attracted by the RF of the computer.

I'd guess they'd be just as attracted by the unusal noise and movement from the diver.

RF energy doesn't penetrate very well under water - Unless your computer is powered by a mini reactor, I wouldn't worry.

 

[alcina]

Put me in the disappointed category, too! I dive with a hoseless computer every dive and have for about 8 or 9 years. Can't seem to get enough sharks nor close enough most dives.

 

[Amphibious]

Hi,

I've talked to several people who have given annecdotal evidence that sharks (other potentially dangerous critters) are somehow attracted by the RF of the computer.

One situation that I saw, a guy nearby was spearfishing, blood every where... yet the sharks were gooing straight at a guy with a wireless cochran 200' away.

I'm considering a D9 or atom (leaning to D9). If I get the gist that other people have experienced this.

Thanks

sounds like someone is feeding you some serious BS. serves the one bloke right for spearing on scuba...tisk tisk tisk. (ditch the tanks next time)

 

[Vie]

I've talked to several people who have given annecdotal evidence that sharks (other potentially dangerous critters) are somehow attracted by the RF of the computer.

One situation that I saw, a guy nearby was spearfishing, blood every where... yet the sharks were gooing straight at a guy with a wireless cochran 200' away.

I wish! I used a “wireless” Cochran (i.e. a Gemini) for a long time and unfortunately it did not attract any sharks. I now use an Atom and sharks do not pay me more attention over other non-AI computer users.

 

[drbill]

Hmmm... all my computers have been "hoseless" since I began using them. Oh, you are referring to the ones that actually telemeter air volume from the tank. Not sure why I'd need one of those... unless the rumors on this thread were true! Did see a few sharks today, but they definitely weren't attracted by my computer.

Dr. Bill

 

[String]

"These electrical cues would be meaningless to sharks, were it not for the astonishing sensitivity of their ampullae. Studies by Adrianus Kalmijn, a pioneer in elasmobranch electroreception, have demonstrated that some sharks -- such as Smooth Dogfish (Mustelus canis) -- are able to detect low frequency (from about 0.5 up to 8 Hertz

Right now factor this up to 400,000,000Hz which is still lower than the frequency used for hoseless transmitters.

30ft claim stands - we arent talking low frequency pulses here.

 

[Warren_L]

"These electrical cues would be meaningless to sharks, were it not for the astonishing sensitivity of their ampullae. Studies by Adrianus Kalmijn, a pioneer in elasmobranch electroreception, have demonstrated that some sharks -- such as Smooth Dogfish (Mustelus canis) -- are able to detect low frequency (from about 0.5 up to 8 Hertz) electric fields as tiny as 5 nanovolts (billionths of a volt) per square centimetre. In 1998, graduate student Steve Kaijura demonstrated that newborn Bonnethead Sharks (Sphyrna tiburo) can detect electric fields less than 1 nanovolt per square centimetre. This is equivalent to the electric field of a flashlight battery connected to electrodes some 10,000 miles (16,000 kilometres) apart in the ocean. Such incredible electrical sensitivity is over five million times greater than anything you or I could feel and is by far the most acute in the Animal Kingdom."

It would be interesting to see what happens with the higher wavelengths nearer the computer transmitter range. Lower wavelengths do tend to be longer, if I remember my high school physics correctly.

 

[DeputyDan]

It you read the original posters other posts - there seems to be a real concern about personal safety when diving.

My advice is to dive and don't worry about the thousands of potential what if's that may happen.

DD