| Administrator | Code | Ship Name |
|---|---|---|
| Hydrographic Department, JCG | YY | Shoyo |
| TA | Takuyo | |
| ME | Meiyo | |
| KA | Kaiyo | |
| TY | Tenyo | |
| Japan Meteorological Agency | RY | Ryofu-maru |
| KF | Keifu-maru | |
| KO | Kofu-maru | |
| SH | Shunpu-maru | |
| CH | Chofu-maru (Old) | |
| NC | Chofu-maru | |
| SI | Seifu-maru | |
| Fisheries Agency | HO | Hokuko-maru |
| YS | Shoyo-maru | |
| HQ | Hokuo-maru | |
| SY | Soyo-maru | |
| YO | Yoko-maru | |
| TK | Tankai-maru | |
| NU | Tansho-maru | |
| SU | Shunyo-maru | |
| MH | Mizuho-maru | |
| IY | Kaiyo-maru | |
| WK | Wakashio-maru | |
| WA | Wakataka-maru | |
| SF | Shirafuji-maru | |
| Others organizations | GH | Hakurei-maru |
| TN | Tansei-maru | |
| IN | Shinyo-maru | |
| CY | Koyo-maru | |
| SP | Shirase | |
| OS | Oshoro-maru | |
| HK | Hakuho-maru | |
| TO | Tokaidaigaku-maru-II | |
| TE | Tenyo-maru | |
| XK | Kaiyo(JAMSTEC) | |
| OH | Hokusei-maru | |
| UM | Umitaka-maru | |
| BO | Bosei-maru-II | |
| NA | Nagasaki-maru |