Homemade magnetometer?? Anyone know how? - SailNet Community
 
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post #1 of 8 Old 06-12-2008 Thread Starter
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Homemade magnetometer?? Anyone know how?

Hey all,

A buddy lost his anchor and all chain rode. It's a huge plow and about 180 feet of chain and he'd really like to get it back. It's only in about 16-20 feet of water and he has gps coordinates and he's dragged the area with a grapnle hook and even had a buddy dive on the site and no luck. It's been several months and is probably buried in the sand.

I once saw plans for a homemade tow-behind magnetometer online but can't find it again. Does anyone have any idea how to build one? As I understand they're not that complicated.

Help is appreciated as always,

Steve
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post #2 of 8 Old 06-12-2008
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You might check out this site...

Geotech - Technology for Treasure Hunting


hope that helps - also a hd depth bottom sounder may work as it will detect hard surfaces even if covered with sand....

-- Jody

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post #3 of 8 Old 06-12-2008
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Here are two sites in a quick Google search that might help

How to make a very sensitive jam jar magnetometer
Regulus! Feature Article.
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post #4 of 8 Old 06-12-2008
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The problem with most home-built magnetometers is that they're really not suitable for use on a boat. Dragging a strong magnet or a bar with several strong magnets, like those used for tool retrieval, along the bottom should at least give you an idea of when you pass over the chain and anchor, provided they're galvanized steel, not stainless steel.

BTW, there's a pretty good chance that a diver found and retrieved your friend's anchor, given the relatively shallow water it was in.

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post #5 of 8 Old 06-12-2008
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BTW, there's a pretty good chance that a diver found and retrieved your friend's anchor, given the relatively shallow water it was in.
Now he really didn't want to hear that little tidbit.

1600 Ton Master, 2nd Mate Unlimited Tonnage

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post #6 of 8 Old 06-12-2008
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A couple of friends of mine scuba dive and they retrieve all sorts of stuff from the bottom. They sell a lot of anchors and chain on Craigslist and the like.

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post #7 of 8 Old 06-12-2008
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The way to go is to get a diver. If you have the spot marked, for a tank of air and a rack of beer you could make it an outing which would be a win win situation.

I had many crab pots once upon a time. I found them and sold them while diving. I found many down rigger balls and anchors while doing the dives. It paid for my diving.

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post #8 of 8 Old 06-12-2008
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If diving is an option, your local commercial diving outfit or some scuba shops should have a diver operated magnetometer either available for rent or should at least be able to point you in the right direction.
Here are some commercial diving companies in your area:
SHORELINE DIVING SERVICES (860) 536-2767
FATHOM SOLUTIONS LLC 860-664-1864
UNDERWATER CONSTRUCTION CORPORATION (860) 767-8256
Now these are members of the Association of Commercial Diving Contractors and could go and find the anchor for you....for big $$$.
Someone there should be able to route you in the right direction though.
If you were nearby, I'd go get it for you for a bottle of rum!

Jon Caisson Bozeman
S/V Little Miss Magic, Pirates Cove, AL
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