The trade in value for KBB and NADA is the wholesale price. Not usually public information. All dealers have the Wholesale book on hand, and that is where they start when giving you a number for your trade in.
When we were looking at upgrading the marina had a big yellow NADA type boat trade-in value. You may need to stop by your local marina and have them price it out for you/ bank. I am sure the boat dealers get these types of calls from banks.