| LD | flotilla leader |
| GB | gunboat |
| SKR | picket ship (storojevoi corabl) |
| SKA | picket cutter (storojevoi kater) |
| RT | fishing trawler |
| MS | minesweeper (TSch (Tralschik) in Russian) |
| ML | minelayer |
| TS | training ship |
| MMSch | motor MS (KATSch, Katernii Tralschik [Rus.]) |
| BP | tug (buksurnii parohod [Rus.]) |
| HS | hydrographic ship |
| RS | rescue ship |