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Local Tidal Differences
Average time differences before HW St Helier
| HW Portrieux | 30 minutes before |
| HW St Malo | 20 minutes before |
| HW Granville | 15 minutes before |
Average time differences after HW St Helier
| HW Guernsey | 5 minutes after |
| HW Sark | 10 minutes after |
| HW Carteret | 10 minutes after |
| HW Dielette | 20 minutes after |
| HW Alderney | 45 minutes after |
| HW Cherbourg | 1 hour 35 minutes after |