The short answer is yes. But if the new owner wishes to keep the boat at the Waterside & Marina it is moored at, a commission is applied. This is called a sale on berth fee which is a percentage + VAT of the overall sale price of the vessel.
This fee is applicable as a mooring location adds value to a boat and the ability to transfer this mooring can see purchasers bypass waiting lists for moorings.
A lot of people prefer to sell their boats through Aquavista, should your location allow, as it is hassle-free.
Also, remember you still have to terminate your mooring contract and give the relevant amount of notice. Log in to your Aquavista account to check your termination period.