working vessel
ship or boat type that primarily does work at sea, rather than as transport
Pioneering Spirit
Dutch ship for platform single-lift installation/decommissioning and pipelaying and crane vessel
service vessel
ship providing support services (not only naval)
dredger
ship type
salvage ship
type of ship used for retrieving wrecked ships
pipe-laying ship
ship type
folding ship
type of vessel with sections that move to perform a function
research vessel
ship or boat designed, modified, or equipped to carry out research at sea
Expeditionary Sea Base
a class of mobile sea base for USN
cable layer
ship type
buoy tender
type of vessel used to maintain and replace navigational buoys
lighthouse tender
a ship or boat designed to support and maintain lighthouses
crane vessel
vessel designed to lift things using a crane permanently attached to the vessel
icebreaker
special-purpose ship or boat capable of maneuvering through frozen bodies of water and remove ice
fireboat
specialized watercraft and with pumps and nozzles designed for fighting shoreline and shipboard fires
York boat
A large, wide, all-wood cargo boat used in Canada
Spatz-class working ship
service vessels of German authorities