| Born | 5 Jun, 1914 | Hannover |
| Died | 13 Apr, 1943 | Bay of Biscay |
|
Ranks
Decorations |
Patrol info
| U-boat | Departure | Arrival | |||||
| 1. | U-376 | 11 Mar, 1942 | Kiel | 12 Mar, 1942 | Helgoland | 2 days | |
| 2. | U-376 | 15 Mar, 1942 | Helgoland | 1 Apr, 1942 | Kirkenes | Patrol | 18 days |
| 3. | U-376 | 7 Apr, 1942 | Kirkenes | 20 Apr, 1942 | Kirkenes | Patrol | 14 days |
| 4. | U-376 | 29 Apr, 1942 | Kirkenes | 6 May, 1942 | Kirkenes | Patrol | 8 days |
| 5. | U-376 | 7 May, 1942 | Kirkenes | 13 May, 1942 | Bergen | 7 days | |
| 6. | U-376 | 7 Jun, 1942 | Bergen | 15 Jul, 1942 | Narvik | Patrol | 39 days |
| 7. | U-376 | 18 Jul, 1942 | Narvik | 20 Jul, 1942 | Bergen | 3 days | |
| 8. | U-376 | 23 Jul, 1942 | Bergen | 27 Jul, 1942 | Wilhelmshaven | 5 days | |
| 9. | U-376 | 27 Sep, 1942 | Wilhelmshaven | 28 Sep, 1942 | Kiel | 2 days | |
| 10. | U-376 | 22 Oct, 1942 | Kiel | 25 Oct, 1942 | Bergen | 4 days | |
| 11. | U-376 | 31 Oct, 1942 | Bergen | 3 Nov, 1942 | Skjomenford | 4 days | |
| 12. | U-376 | 5 Nov, 1942 | Skjomenford | 8 Dec, 1942 | Narvik | Patrol | 34 days |
| 13. | U-376 | 10 Dec, 1942 | Narvik | 13 Dec, 1942 | Bergen | 4 days | |
| 14. | U-376 | 26 Jan, 1943 | Bergen | 28 Jan, 1943 | Bergen | Patrol | 3 days |
| 15. | U-376 | 30 Jan, 1943 | Bergen | 13 Mar, 1943 | La Pallice | Patrol | 43 days |
| 16. | U-376 | 6 Apr, 1943 | La Pallice | 13 Apr, 1943 | Sunk | Patrol | 8 days |
Ships hit by Friedrich-Karl Marks
| Date | Boat | Name of ship | Tons | Nat. | Convoy | Fate * | |
| 30 Mar, 1942 | U-376 | Induna | 5.086 | | br | PQ-13 | |
| 10 Jul, 1942 | U-376 | Hoosier | 5.060 | | am | PQ-17 | |
| 10.146 | |||||||
* Unless otherwise noted the ships listed here were sunk. | |||||||
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Decorations and ranks information is in many cases not complete. If you can help on any of those missing that would be great.

