No matter what source book you refer to, it is not a definite value for any particular brand and model of boat because you can have two boats, same make, same year, same model sitting next to each other and they can have totally different values. One can be a fresh water boat and another a salt water boat. One can be very well maintained and another in deplorable condition (or anywhere in between). One can be very well equipped and another be marginally equipped. Equipment and sails can be newer on one, or a mix match between the two. Each boat has to be further examined and it gets very subjective. These used boat guidelines are averages. I have seen two boats that are exactly the same brand and model and year, but they are so different in appearance and equipment you might not recognize them as the same model.