you can use pretty much any monitor or TV that has a video input jack on it.....even saw one guy who was playing back his recordings at home with the video out to a 55" TV to try to see things he missed on the water.
Your considerations would include whether the monitor is sunlight visible, is it durable enough to use in a boat, what power is required to power it, etc.
Some have even used a monitor designed for a DVD.
There are some marine monitors designed for this, but they are very expensive.