Sidebar-To track leaking current in a marina build a simple, portable, mobile corrosion skiff corrosion monitor. Place dissimilar metals in the water about two meters apart and monitor the voltage. In short we will have built a submerged electrical field monitored from inside a moveable skiff. In other words, a directional antenna. When the space between the sensors encounters another electrical field the meter voltage changes. Rotate skiff until the highest voltage is found and follow the line to the source of the leak. To the vessel owner this means an inexpensive method of tracking errant electrical leaks. To the harbormaster this means a skiff can drive through the marina and detect stray current.