Deeper’s Fishfinder is a nifty portable sonar device for anglers. It helps amateurs and professionals alike learn just about everything they need know about their fishing environment. A very versatile little device, Fishfinder can be used in just about any environment it seems and can be used with both iOS and Android. A small sonar ball basically floats on the surface of the water sending data back to the fisherman who can visualize the data in real time. Learn more at their website and/or check out the video below.