Portable fishfinders and bathyscopes

It is not always necessary to mount an instrument on the bridge, especially in small boats. The portable depth sounder in these cases is what is needed. In fact, these devices are capable of detecting all the necessary information. In addition to the hand-held sounder that simply shows the depth, the handheld sounder instead provides an app that can be downloaded to the smartphone, also detecting the movement and depth of fish to provide the right tip to the sport fisherman.