| Navy | The US Navy |
| Type | Motor torpedo boat |
| Class | ELCO 80' |
| Pennant | |
| Built by | Electric Launch Company Ltd. (Elco), (Bayonne, New Jersey, U.S.A.) |
| Ordered | 27 Apr 1943 |
| Laid down | 6 Oct 1943 |
| Launched | 29 Dec 1943 |
| Commissioned | 25 Jan 1944 |
| Lost | 9 Aug 1944 |
| Loss position | 49° 11'N, 2° 15'W |
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| History | USS PT 509 (Lt. H.M. Crist, USNR) was sunk by gunfire and ramming from a German minesweeper off Jersey, English Channel in position 49º11'N, 02º15'W. |
The American motor torpedo boat USS PT 509 lost on 9 Aug 1944 in position 49° 11'N, 2° 15'W.Commands listed for USS PT 509
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt. Harry M Crist, USNR | ??? | 9 Aug 1944 |
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