Mounted forward on our mast head, is a wireless masthead transducer by B&G. It charges via a small built in solar panel and has a built in battery too, so there are no wires to run down the mast. It works by connecting to the supplied bluetooth puck wired into our NMEA 2000 network backbone. You can monitor the state of charge and battery level right in the main plotter screen. It was very easy to instal and works even when it’s cloudy for weeks at a time.