if you put it in a boat expect the unexpected as far as getting wet, or at least getting banged around!
As far as battery power i would get a big deep cycle and recharge at home at the end of the day. I just have a am/fm cd player on my boat and it is plenty loud enough!
I have a 2003 Yamaha 200 HDPI no idea what the charging system puts out, but i run a 2 battery system with out any problems. Radio, GPS all day long on one battery. If ever needed to just switch on the 2nd battery and go home.
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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