Underwater Detecting

Welcome from Australia!

I no longer dive but still snorkel and wade in the water a lot. When I was diving, I built my own underwater machine which was encased in a waterproof flashlight housing (one of the large ones that took a 6 volt lantern battery). With that much air around my electronics, it was no surprise that it wanted to be more of a buoy than a detector. My solution was to fill the inside with plastic Zip-Loc(tm) baggies full of fine sand which fit between the board and the case. This changed both the specific gravity of the entire unit and gave a bit of weight to the machine. Hardly noticeable in the water. The machine was much more relaxing to use since I didn't have to fight it constantly to keep it to hand.

I don't know if you have access to that portion of the Fisher to try that solution. Someone here built a magnetometer for underwater use and filled the case with high density moly type axle grease. It kept the issue of pressure from depth being a problem and also compensated for the buoyancy issue. He had movable fins on that baby and a camera in the nosecone. I'm not sure if he actually posted detailed information about the project here or just via e-mail.

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i have a seas hunter mark 2 , i have used it once diving and going to use it this weekend (m tomorrow ) for the seconded time , will let you know how i go

Posted on: October 09, 2010, 01:35:57 AM

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ooops .... sea hunter mark 2 ......use it on owe local beaches .....have done quiet well ...... 3 gold rings ..... 4 silver rings .....4 stainless steel rings and odds and ends , about $55 in change ..... now our summer is coing will be going a lot more and using it diving also

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