How does the PI-iKing compare to other scuba detectors? My son is forever dropping things from his yacht (including keys, phones, tools, fishing rods, spearguns etc).. Although he’s a good scuba diver and spear-fisherman, where his yacht is anchored at the mouth of a tidal river the visibility is always close to zero.. Although he’s had a couple of successful duck-dives, he’s found the best way to recover lost metallic items has been to attach a powerful Neodymium recovery magnet (pulling f