| Name: | SAN JUAN |
| Type: | Hydrographic Ship |
| Launched: | 27/09/1927 |
| Completed: | 1928 |
| Builder: | R & W Hawthorn, Leslie & Co Ltd |
| Yard: | Hebburn |
| Yard Number: | 547 |
| Dimensions: | 687grt, 213nrt, 196.5 x 33.0 x 14.0ft |
| Engines: | Oil engine, 4SCSA, Werkspoor type, 190nhp |
| Engines by: | R & W Hawthorn, Leslie & Co Ltd, Newcastle |
| Propulsion: | 1 x Screw, 12.0knots |
| Construction: | Steel |
| Reg Number: | n/a |
| History: | |
| 1928 | Government of Argentina - Argentine Navy |
| 1937 | Renamed COMODORO RIVADAVIA |
| 1942 | Renamed MADRYN |
| 1967 | Broken up |
| Comments: | 1959: Converted to a training ship |
| 1967: Sold to Ayarsa SA for breaking up |
Above photo as SAN JUAN is courtesy of David Asprey
Above photo as MADRYN is courtesy of Histarmar
Above photo as MADRYN is courtesy of Histarmar
Above photo as MADRYN is courtesy of Histarmar