I have always had to have genny running to watch the LCD as batts didn't quite give the power. I was recommended this product by another boater. He says it stops a lot of lines caused by the genny as well. Trying out this weekend and will let you know!
I may be missing the point but i thought that most people get on the water to escape the TV and all the trappings of life that are attached to living in a house with a normal job.