Southerly - I use a Mako Magnet when shark fishing.
It gives off vibrations like a wounded fish.
The company also sells a Tuna Magnet - imitates a school of fish.
Some guys mount them inside the hull and use them when trolling.
The Mako magnet works great - I've had sharks come in from up current of the chum line and hit the magnet. Had to send 1st one back for repairs. New one is protected in a milk crate.
Sound underwater travels far. Not sure how fish hear it though.
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