| 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.
| 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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