| Abbreviation | Definition |
|---|---|
| YFP | Yard Craft, Floating Power barge |
| YFR | Yardcraft, Refrigerated Covered Lighter ( Self-Propelled) |
| YFRN | Yardcraft, Refrigerated Covered Lighter ( Non-Self-Propelled) |
| YFT | Yard Craft, Range Tender |
| YFU | Yardcraft, Harbor Utility Craft |
| YG | Yardcraft, Garbage Lighter (Self-Propelled) |
| YGB | Yard Icebreaker (Yardcraft, General, ice Breaker) |
| YGN | Yard Craft, Garbage Lighter (Non-Self Propelled) |
| YN | Yardcraft, Netlayer |
| YNG | Yardcraft, Net, Gate vessel |
| YO | Yard Oiler |
| YP | Yard Patrol boat |
| YR | Yard Repair |
| YSP | Yard Salvage Pontoon |
| YT | Yard Tug |
| YTB | Yard Tug, Big |
| YTL | Yard Tug, Small |
| YTM | Yard Tug, Medium |
| YTT | Yardcraft, Torpedo Testing barge |
| YW | Yardcraft, Water barge |