Some vessels carry boats so there is no lower limit.
Ships, boats etc used for military purposes.
100ft.
100ft
Personal Watercraft (PWC) Fishing boats Recreational powerboats Military or naval craft
Traditionally it was vessels under 200 feet long. Vietnam Riverine Boats (Brown Water Navy) were all considered boats; Swift Boats (PCF-Patrol Craft Fast), PBR's (Patrol Boat River), Monitors (River Battleships), and Alpha Boats (ASPB-Assault Support Patrol Boats). Blue Water Naval vessels were Frigates, Destroyers, Cruisers, etc.
U-boats were for attacking enemy shipping.
Excursion Boats Naval Parade - 1898 was released on: USA: September 1898
Blood vessels
Police Boats Escorting Naval Parade - 1898 was released on: USA: September 1898
hotwell
civil engineer
A person who designs boats and ships.