Unless your boat is new or just a few years old, you’ll likely need to go with an agreed value or actual cash value policy because insurance companies will rarely offer replacement value policies on older boats. And in all of these cases, you personally won’t play much of a role in determining the valuation of your boat. More likely, the insurer will let you know what value they’re willing to place on the boat and you may or may not have the option to push for a higher valuation, possibly depending on what you’re willing to pay in premiums. Once again, however, it seems that book value plays a significant role.