| Departure | Convoy | Arrival |
| Halifax, Aug 8, 1940 |
| HX.64 (Halifax - Liverpool) |
| Methil Roads, Aug 24, 1940 |
| Methil, Sep 14, 1940 |
| OA.214 (Methil - Dispersed) |
| |
| Halifax, Oct 8, 1940 |
| HX.79 (Halifax - Liverpool) |
| Sydney CB, Oct 16, 1940 |
| Sydney CB, Oct 24, 1940 |
| SC.9 (Sydney CB - Liverpool) |
| Liverpool, Nov 9, 1940 |
| Clyde, Nov 11, 1940 |
| WN.37 (Clyde - Methil) |
| Methil, Nov 16, 1940 |
| Methil, Nov 18, 1940 |
| FS.338 (Methil - Southend) |
| Immingham, Nov 20, 1940 |
| |
| FN.346 (Southend - Methil) |
| Methil, Dec 1, 1940 |
| Methil, Dec 2, 1940 |
| EN.35/1 (Methil - Oban) |
| Oban, Dec 6, 1940 |
| Halifax, Feb 18, 1941 |
| SC.23 (Halifax - Loch Ewe) |
| Loch Ewe, Mar 9, 1941 |
| |
| WN.97 (Clyde - Methil) |
| Methil, Mar 14, 1941 |
| Sunderland, Apr 13, 1941 |
| EC.6 (Southend - Clyde) |
| Loch Ewe, Apr 16, 1941 |
| Halifax, May 27, 1941 |
| HX.129 (Halifax - Liverpool) |
| Liverpool, Jun 12, 1941 |
| Belfast Lough, Jun 12, 1941 |
| BB.33 (Belfast Lough - M Haven) |
| Milford Haven, Jun 13, 1941 |
| Liverpool, Jul 17, 1941 |
| OB.348 (Liverpool - Halifax) |
| Halifax, Jul 31, 1941 |
| Halifax, Aug 16, 1941 |
| HX.145 (Halifax - Liverpool) |
| Liverpool, Aug 31, 1941 |
| Belfast Lough, Aug 31, 1941 |
| BB.70 (Belfast Lough - M Haven) |
| Swansea, Sep 2, 1941 |
| Milford Haven, Sep 12, 1941 |
| ON.16 (Liverpool - Dispersed) |
| |
| Erna Iii was lost in the N. Atlantic on Sep 22, 1941 whilst sailing independently. Cause of loss: U 562. |
|---|---|---|---|---|---|