My Go pro helps me out A LOT! Now it doesn't have a great wifi to phone live imaging and it does drain your phone battery IF you chooese to use the WiFi... BUT If you just turn on Video and drop it overboard.. when you get home,its like a kid at Christmas just waiting to see what you videoed down there on Old Hickory!
Plus they are pretty cheap on Ebay. My Method is i put a rubber band around mine and tie a 10 or 12lb line to it and drop it off the edge of the boat and go about my fishing..Then at the end of day,watch what i video'd.