| BBU | Bulk |
| BCB | Bulk/c.c. |
| BCE | Cement Carrier |
| BOR | Ore Carrier |
| BWC | Wood-chip Carrier |
| CBO | Bulk/oil |
| COO | ore/oil |
| DBD | Bucket Dredger |
| DCH | Cutter Suction Hopper Dredger |
| DCS | Cutter Suction Dredger |
| DDR | Dredger |
| DGD | Grab Dredger |
| DGH | Grab Hopper Dredger |
| DHD | Hopper Dredger |
| DSD | Suction Dredger |
| DSH | Suction Hopper Dredger |
| DSS | Sand Suction Dredger |
| DTD | Trailing Suction Dredger |
| DTS | Trailing Suction Hopper Dredger |
| FFC | Fish Carrier |
| FFF | Fish Factory |
| FFP | Fishery Protection |
| FFS | Fishing |
| FWF | Whale Factory |
| FWH | Whaler |
| GCT | Cargo/training |
| GGC | General Cargo |
| GPC | Part c.c. |
| GRF | Ref. |
| LNG | Lng |
| LNP | Lng/Lpg |
| LPG | Lpg |
| MLV | Livestock Carrier |
| MPR | Passenger |
| MVE | Vehicle Carrier |
| OBA | Barge |
| OBS | Buoy Ship/supply |
| OBY | Buoy Ship |
| OCL | Cable Ship |
| OCP | Cablepontoon |
| OCS | Crane Ship |
| OCX | Crane Barge |
| ODE | Depot Ship |
| ODS | Diving Support Ship |
| OES | Exhibition Ship |
| OFL | Floating Crane |
| OFY | Ferry |
| OHB | Hopper Barge |
| OHF | Hydrofoil |
| OHL | Semi-submersible Heavy Lift Vessel |
| OHS | Hospital Ship |
| OHT | Semi-submersible Heavy Lift Tank |
| OIB | Icebreaker |
| OIF | Icebreaker/ferry |
| OIS | Icebreaker/supply |
| OIT | Icebreaker/tender |
| OLC | Landing Craft |
| OLT | Lighthouse/tender |
| OMN | Mining Ship |
| OMS | Mission Ship |
| OMT | Maintenance Vessel |
| OOS | Storage Ship |
| OPA | Patrol Ship |
| OPD | Paddle Steamer |
| OPI | Pilot Ship |
| OPL | Pipe Layer |
| OPO | Pontoon |
| OPP | Pipe Carrier |
| ORD | Radio Ship |
| ORN | Ro/Ro Pontoon |
| ORP | Repair Ship |
| ORX | Repair Barge |
| OSB | Storage Barge |
| OSC | Sludge Carrier |
| OSP | Semi-submersible Pontoon |
| OSS | Storage Ship |
| OSU | Support Ship |
| OSV | Salvage Ship |
| OSY | Supply Ship |
| OSZ | Standby Safety Vessel |
| OTB | Tank Barge |
| OTC | Tank Cleaning Ship |
| OTN | Tender |
| OTR | Training Ship |
| OWA | Waste Ship |
| OWO | Work Ship |
| PRR | Passenger Ro/Ro |
| RHR | Hydrographic Research Vessel |
| RMR | Meteorological Research Vessel |
| ROR | Oceanographic Research Vessel |
| RRB | Research/buoy Ship |
| RRE | Research Ship |
| RRS | Research/supply Ship |
| RSR | Seismographic Research Vessel |
| TCH | Chem. Tank |
| TTA | Tank |
| TWN | Wine Tank |
| UBC | Barge Carrier/c.c. |
| UBG | Barge Carrier |
| UCC | Container Carrier |
| UCR | C.c.Ref |
| URC | Ro/Ro/c.c. |
| URR | Ro/Ro |
| XAA | Anchor Handling Salvage Tug |
| XAF | Anchor Handling Firefighting Tug/supply |
| XAG | Anchor Handling Firefighting Tug |
| XAH | Anchor Handling Tug/supply |
| XAT | Anchor Handling Tug |
| XCT | Catamaran Tug |
| XFF | Firefighting Tug |
| XFS | Firefighting Tug/supply |
| XFT | Firefighting Tractor Tug |
| XPT | Pusher Tug |
| XST | Salvage Tug |
| XTG | Tug |
| XTI | Tug/icebreaker |
| XTP | Tug/pilot Ship |
| XTR | Tractor Tug |
| XTS | Tug/supply Ship |
| XTT | Tug/tender |
| XTX | Tug/support Ship |
| YDP | Drill Platform |
| YDS | Drill Ship |