Back in 2001 I invested in a fishing boat. I figured that living on a waterfront property year round, it was a logical decision. However, it's been over 6 years since I got it and the outboard motor for it probably has less than 25 hours total usage. In fact, last summer I used the boat only once and I have yet to take it out this summer. Since I hardly ever use it, I am thinking about selling it. Is there anything like a black book equivalent that people use to evaluate cars to see how much my boat is worth?