Boats in this section that are identified as 'Sailing' are made for play in water.  Each is carefully tested for the appropriate use and are listed in a category based on your play needs.  You can always “down grade” and use a more serious boat in calmer conditions.  (As an example you can use a Pond boat in a pond, or in a pool or a tub.  Just nothing larger than a Pond.) Boats labeled for ground play cannot be used in water.