The FishHunter will turn your smartphone into what its name suggests. And instead of strapping the sonar hardware to the side of a boat or dock, the device is small enough to float on the water's surface, letting you tether it with fishing line so it doesn't drift off too far.



The FishHunter can scan depths of up to 120 feet below the water's surface for around six to nine hours. Check it out here if you're interested:

[Fish Hunter]