| Acronym | Meaning |
 | YAG | Yttrium Aluminum Garnet |
| YBD | Bowdock |
| YC | Open Lighter (non Self-propelled) |
| YCF | Car Float (non Self-propelled)(lighter) |
| YCV | Aircraft Transportation Lighter (non Selfpropelled) |
| YD | Floating Crane (non Self-propelled)(misc) |
| YDT | Diving Tender (non Self-propelled)(misc) |
| YF | Covered Lighter (self-propelled) |
| YFB | Ferry Boat Or Launch (self-propelled)(misc) |
| YFD | Yard Floating Dry Dock (non Self-propelled) |
| YFN | Covered Lighter (non Self-propelled) |
| YFNB | Large Covered Lighter (non Self-propelled) |
| YFND | Dry Dock Companion Craft (non-self Propelled) (misc) |
| YFNX | Lighter (special Purpose)(non Self-propelled) |
| YFP | Floating Power Barge (non Self-propelled) (misc) |
| YFR | Refrigerated Covered Lighter (self-propelled) |
| YFRN | Refrigerated Covered Lighter (non Selfpropelled) |
| YFRT | Covered Lighter (range Tender) (self-propelled) (misc) |
| YFU | Harbor Utility Craft (self Propelled)(lighter) |
| YG | Garbage Lighter (self-propelled) |
| YGN | Garbage Lighter (non Self-propelled) |
| YHLC | Salvage Lift Craft, Heavy (non Self-propelled) |
| YIG | Yttrium Iron Garnet |
| YM | Dredge (self-propelled)(misc) |
| YNG | Gate Craft (non Self-propelled)(misc) |
| YO | Fuel Oil Barge (self-propelled)(tanker) |
| YOG | Gasoline Barge (self-propelled)(tanker) |
| YOGN | Gasoline Barge (non Self-propelled)(lighter) |
| YON | Fuel Oil Barge (non Self-propelled)(lighter) |
| YOS | Oil Storage Barge (non Self-propelled) (lighter) |
| YP | Patrol Craft (self-propelled)(misc) |
| YPD | Floating Pile Driver (non Self-propelled)(misc) |
| YR | Floating Workshop (non Self-propelled)(misc) |
| YRB | Repair And Berthing Barge (non Self-propelled) (misc) |
| YRBM | Repair, Berthing And Messing Barge (non Self-propelled) |
| YRDH | Floating Dry Dock Workshop (hull) (non Self-propelled)(misc) |
| YRDM | Floating Dry Dock Workshop (machine) (non Self-propell)(misc) |
| YRR | Radiological Repair Barge (non Self-propelled) (misc) |
| YRST | Salvage Craft Tender (non Self-propelled)(misc) |
| YSD | Seaplane Wrecking Derrick (self-propelled)(misc) |
| YSR | Sludge Removal Barge (non Self-propelled) (lighter) |
| YTB | Large Harbor Tug (self-propelled) |
| YTL | Small Harbor Tug (self-propelled) |
| YTM | Medium Harbor Tug (self-propelled) |
| YW | Water Barge (self-propelled)(tanker) |
| YWN | Water Barge (non Self-propelled)(lighter) |
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