| Navy | The Royal Navy |
| Type | MS Trawler |
| Class | [No specific class] |
| Pennant | FY 920 |
| Built by | Cook, Welton & Gemmill (Beverley, U.K.) |
| Ordered | |
| Laid down | |
| Launched | 18 Jul 1912 |
| Commissioned | 1940 |
| Lost | 16 Jun 1942 |
| Loss position | 51° 13'N, 1° 28'E |
| History | Completed in October 1912. On 16 June 1942 HMS Tranquil (T/Lt. William Postlethwaite, RNR) was sunk in a colission with the British merchant Deal (829 GRT, built 1928) off the Downs in position 51°13.08'N/01°27.51'E. |
Commands listed for HMS Tranquil (FY 920)
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. John Enevoldsen, RNR | 20 Jun 1940 | 23 Jan 1941 |
| 2 | Ch.Skr. James Bond, RD, RNR | 23 Jan 1941 | 12 Jun 1941 |
| 3 | T/Lt. William Postlethwaite, RNR | 12 Jun 1941 | 16 Jun 1942 (+) |
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