more than 1000 BRT:
| Name | Launched // Comm. | Builder | Tonnage, BRT | Dimensions (LppxB), m | Speed, kts | Machinery, Fuel, t | Armament | Fate |
| Lady Fraser | 14.3.1908 // mid-1917 | Fairfield, Govan, UK | 1669 | 86.0x11.6 | 12.5 | 2VTE | stricken 1919 | |
| Mayo | 23.9.1896 // mid-1917 | Swan Hunter, Wallsend, UK | 1778 | 85.6x11.6 | 1VTE | sunk 8.9.1916 |
100 - 1000 BRT:
|
miscellaneous patrol vessels Bahrein (,, 5.1915 - 1919); Bhamo (1896, 255, mid-1917 - 1919); Elephanta (,, mid-1917 - 1919); Sladen (1886, 270, mid-1917 - 1919); Azerbaijan (,, 10.1918 - 11.1919) |
Project history: merchant vessels converted to armed boarding steamers. They were employed on examination duties at sea for the purpose of enforcing the naval blockade.
Modernizations: None.
Naval service: Format of date including day/month/year means loss of the vessel. Format of date containing month/year means return to owner or conversion to miscellaneous vessel. Mayo was sunk 8.9.1916 by German submarine.
© Ivan Gogin, 2015