| Navy | The Royal Navy |
| Type | MS Whaler |
| Class | [No specific class] |
| Pennant | FY 1725 |
| Built by | Smiths Dock Co., Ltd. (South Bank-on-Tees, U.K.) |
| Ordered | |
| Laid down | |
| Launched | 11 Jul 1930 |
| Commissioned | Nov 1940 |
| Lost | 29 May 1944 |
| History | Norwegian whaler of Hvalfangerselskap Kosmos A/S (Anders Jahre), Sandefjord, Norway taken over by the Admiralty in November 1940. Renamed HMS Firmament in September 1941. HMS Firmament (T/Skipper J. Muttitt, RNR) stranded off Alexandria, Egypt on 29 May 1944 and lost. |
Commands listed for HMS Kos IX (FY 1725)
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | T/Skr. Gilbert Parkinson, RNR | 9 Apr 1942 | Apr 1943 |
| 2 | T/Skr. John Muttitt, RNR | Apr 1943 | 30 May 1944 |
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