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Old 06-07-2020, 07:35   #61
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Re: Electric magnetic field heath problems and sea sickness

From years of personal experience, I found no problem with sleeping above batteries for months at a time. Like your's, our battery bank was below our bed and it never affected us adversely.

The sea, once it casts its spell, holds one in its net of wonder forever.
—Jacques Yves Costeau
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Old 06-07-2020, 07:41   #62
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Re: Electric magnetic field heath problems and sea sickness

Ralsy, If you really have a concern about Electro Magnetic Radiation, I suggest you take a course in basic electricity and electronics. It will help you to understand why there is very little danger associated with EMR except at very high levels. Frankly your Microwave oven puts out more EMR than probably anything else you are exposed to, except it is all contained in what is called a Faraday Cage and so it heats your coffee instead of you.

In my early Coast Guard career I worked with radars and computers and other electronics and was constantly exposed to low levels of EMR. I did that for over 7 years until I got a commission and went on to other things. I'm now 75 and have a few underlying medical conditions but none due to EMR exposure.

In our modern technological society we are constantly exposed to EMR. It's all around us, TVs, Microwave ovens, cell phones, radios and countless other electronic devices. If it was really a problem there would be millions of people with medical conditions such as tumors and cancers from exposure. It takes a lot of power and long exposures to cause theses kinds of problems. For instance Gun and missile fire control radars do emit extremely high levels of EMR. But only a fool would stand in front of one of the transmitters. They are highly focused in tight beams only at their target. We used to check to see if ours (which was a really low power one compared to the newer stuff) by holding a flourescent light tube in front of the dish. If the light lit up it was working.

Anyway, as many have said here a 12 volt DC system is no real danger to you. The only real danger to 12V DC is if a dead short occurs and melts the wires and starts a fire, but that's why there are fuses or circuit breakers to prevent that. You could sit next to a 12V battery for years with no affect whatsoever.

So don't worry about it.

I would be far more concerned about the stability and rollign of the boat as has been pointed out. especially the fuel tanks. If you can't start a voyage with full fuel and water tanks you have a serious problem. I would avoid a boat like that

"Dont tell me I can't, tell me how I can"
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Old 06-07-2020, 07:50   #63
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Re: Electric magnetic field heath problems and sea sickness

If 1000A was flowing, possibly. Some people are ultra-sensitive, but I very much doubt even they would be sensitive to DC fields of that level.
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Old 06-07-2020, 07:51   #64
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Re: Electric magnetic field heath problems and sea sickness

Originally Posted by Ralsy View Post lack of knowledge, but what are sponsors?
Sponsons (not sponsors) are long blisters fastened to each side of the hull below the waterline. Typically placed about where a chine would be on a chine hulled boat. They effectively increase the beam and reduce rolling. Just like a boat built with a hard chine will likely be less rolly than an otherwise identical round hulled boat.
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Old 06-07-2020, 14:13   #65
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Re: Electric magnetic field heath problems and sea sickness

Some replies to this post have combined RF emissions and magnetic fields as one thing. DC power creates a magnetic filed in a wire. I have never seen any evidence that this causes health problems but some people believe they are affected by close contact with such fields.
RF emissions are a radio transmission. We live constantly immersed in radio waves from radio and TV broadcast signals.
The biggest contributor to sea sickness I have identified on boats, apart from hull movement, is mould growing in cabin linings. I believe the emissions from mould area far greater problem than any from electricity.
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Old 06-07-2020, 14:32   #66
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Re: Electric magnetic field heath problems and sea sickness

Unfortunately mold toxicity issues are yet another pseudoscience. There is no scientific data that supports mold being anything “toxic”. I am well aware that thinking that it is toxic well established the the community at large, but there’s nothing behind it. Look it up (in reliable sources) if you don’t believe me.
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Old 06-07-2020, 15:32   #67
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Re: Electric magnetic field heath problems and sea sickness

Sad thing is I learnt this from a neurosurgeon guess you need to update your knowledge base before throwing your credentials around.
Birds use magnatite for navigation and we have it in our brain.
Originally Posted by BoatBumm View Post
As a Board-Certified Emergency Physician, PhD Neuroscientist, and a serious sailor, I am unaware of any real science that supports that magnetic fields have any effect of any kind on the human body. We have nothing in us, especially our brains, that is magnetic*. MRI scanners use massively strong magnetic fields to force water molecules to "flip" and emit a weak radio signal, but those too have never been shown to cause any ill effects. The people that run those machines are routinely daily exposed to the fields - no problem. And those magnetic fields are many orders of magnitude stronger than anything a boat's 12 volt system would ever generate. That would require massive currents to generate a strong magnetic field. And if the return electric wire runs parallel to the wire that you are worried about - the two induced magnetic fields would cancel each other out. (Hence the routine recommendation for a "twisted pair of wires" to supply power to the compass light - cancels out any induced magnetic field that could affect the compass.) Running around on the boat with a simple handheld compass while someone is turning circuits off and on would tell you if any magnetic field is being induced outside of Mother Earth's. And even if it is - again it would be very weak and there is zero evidence that would have an effect on a human. Anyone who says that it does are likely in the "magical crystal amulet and copper bracelet" crowd.

Any "excess seasickness" associated with the boat is likely a combination of the boat's design (especially tendency to roll), the sea state, the individual's general susceptibility towards seasickness, and perhaps psychology - if you think the boat is likely to make you seasick - it probably will.

(*There are some recent reports saying that some birds that navigate long distances to migrate have sensors in their brains that can detect the Earth's natural magnetic fields - fascinating! Humans don't have those.)
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Old 06-07-2020, 15:56   #68
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Re: Electric magnetic field heath problems and sea sickness

Originally Posted by BoatBumm View Post
Unfortunately mold toxicity issues are yet another pseudoscience. There is no scientific data that supports mold being anything “toxic”. I am well aware that thinking that it is toxic well established the the community at large, but there’s nothing behind it. Look it up (in reliable sources) if you don’t believe me.
Ok. Here are 99 references. Should I post the other 312?

1. World Health Organization (WHO). WHO Guidelines for Indoor Air Quality – Dampness and Mould. Published 2009.

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4. Daschner A. An Evolutionary-Based Framework for Analyzing Mold and Dampness-Associated Symptoms in DMHS. Front Immunol. January 2017;7(672).

5. McMahon SW, Hope JH, Thrasher JD, Rea WJ, Vinitsky AR, Gray MR. Global Indoor Health Network (GIHN). Common Toxins in Our Homes, Schools and Businesses. December 17, 2012. (This 2012 position statement by GIHN has been replaced with new papers on individual topics.)

6. Gray MR. Progressive Healthcare Group. Progressive Healthcare Group.

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11. Etzel RA. Toxic Effects of Indoor Molds. Amer Acad Pediatr. 1998 Apr;101(4)712-714.

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Old Yesterday, 00:54   #69
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Re: Electric magnetic field heath problems and sea sickness

Originally Posted by BoatBumm View Post
(*There are some recent reports saying that some birds that navigate long distances to migrate have sensors in their brains that can detect the Earth's natural magnetic fields - fascinating! Humans don't have those.)

There's little doubt that birds sense magnetic fields and not just long distance migratory ones.We even think we know how they do it:

Humans? Maybe:
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Old Yesterday, 00:57   #70
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Re: Electric magnetic field heath problems and sea sickness

Originally Posted by Thumbs Up View Post
Ok. Here are 99 references. Should I post the other 312?
Strike Two for our neuroscientist?
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Old Yesterday, 02:39   #71
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Re: Electric magnetic field heath problems and sea sickness

Originally Posted by StuM View Post

Does this mean I no longer need a compass on the boat?
Count-down has commenced.
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Old Yesterday, 10:38   #72
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Re: Electric magnetic field heath problems and sea sickness

Need new batteries. And it is already necessary to build on this.

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electric, sea sickness

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