| Displacement | 950t standard | |
|---|---|---|
| Length | 66.0m | |
| Width | 10.4m | |
| Draught | 3.4m | |
| Machinery | 2-shaft diesel, 3200bhp | |
| Speed | 16kt | |
| Armament | 1-76mm/50cal. gun, 2-20mm MG, 4 DCTs, 40 mines | |
| Sensor | Radar: OPS-16 | |
| Complement | 100 | |
| (after refit in 1970) | ||
| Displacement | 2150t standard | |
| Length | 103.0m | |
| Width | 14.6m | |
| Draught | 4.9m | |
| Speed | 13kt | |
| Armament | 2-20mm MG | |
| Complement | 103 | |
| Number | Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|---|
| ARC-481 | Tsugaru | FY1953 | MHI, Yokohama | 1954.12.18 | 1955. 7.19 | 1955.12.15 | Layer | (Ominato district) 1957. 9. 1 Numbered (ARC-481) (Yokosuka district) 1961. 9. 1 (MSFlotilla2, SDF) 1969.10. 1 (Ocean survey unit) 1980. 3.17 Auxiliary Service ship (ASU-7001) (Ocean survey command) 1990. 3.15 disc |