How many passengers are permitted on a "T-Boat"?

There are 3 criteria, used to determine the number of passengers:

1. "Length of Rail" criteria, allowing 30 inches of rail space along the vessel's sides and transom for each passenger
2. "Deck Area" criteria that permits one passenger for every 10 square feet of deck space available for passenger use
3. "Fixed Seating" criteria that allocate 18 inches of space for each passenger to rest his/her buttocks upon

Any of them or their combination may be used.