| Navy | The Royal Navy |
| Type | MS Trawler |
| Class | [No specific class] |
| Pennant | FY 1852 |
| Built by | Cook, Welton & Gemmill (Beverley, U.K.) |
| Ordered | |
| Laid down | |
| Launched | 19 Jul 1913 |
| Commissioned | May 1941 |
| End service | |
| History | Completed on 17 September 1913. Renamed Portia in 1940/1941. |
Commands listed for HMS Unitia (FY 1852)
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 | J Pidgen, RNR | 29 May 1940 | 30 Aug 1940 |
| 2 | Jasper Alfred Stanberry Pidgen, RNR | 30 Aug 1940 | 1 Jul 1941 |
| 3 | T/Lt. Kennedy William Harrison, RNVR | 1 Jul 1941 | late 1941 |
| 4 | T/S.Lt. Arthur John Carr, RNVR | late 1941 | 6 Aug 1942 |
| 5 | T/S.Lt. Gordon Hardy, RNVR | 6 Aug 1942 | 27 Nov 1942 |
| 6 | T/Lt. Eric Higson Greenwood, RNVR | 27 Nov 1942 | mid 1945 |
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