Wireless GPS? Who would of thunk?
Even lowly fishing boats are heavily equipped with electronics these days.
A typical fishing boat now has GPS, including full mapping, sophisticated sonar systems, and often even underwater television cameras, all in the interest of finding fish and catching them.
That's not to mention the VHF radio, and for those who go offshore, radar, and more.
I just added side-scanning sonar capabilities to my own boat. With it, I see a 3-D representation of the water column and bottom structures. That includes seeing individual fish in something like a dead tree on the bottom.
It's amazing. It truly is amazing.