Period | Duration effective | Instrument | Frequency | Unit measurement | System | Type archives | Source |
1912 | 3 months | Tide scale | 30 min. | Metric | Time Universal | Register | SHOM (Brest |
1928 | 9 days | Medimeter | 1 day | Metric | Time Universal | Register | SHOM (Brest) |
1949 | 1 month | Tide scale | Diurnal-15 min. | Metric | Time Universal | Register | SHOM (Brest) |
1950 | 1 year | Shiny tide gauge | 2 hours | Metric | Time Universal | Telegram | SHOM (Brest) |
1951-1954 | 4 years | Float tide gauge | 10 min. | Metric | Time Universal | Telegram | SHOM (Brest) |
1964-1965 | 2 years | Tide gauge float switch | 10 min. | Metric | Time Universal | Telegram | DDH PAA |
1974-2011 | 37 years old | Tide gauge float switch | 10 min. | Metric | Time Universal | Telegram | DDH PAA |
2012-2016 | 5 years | Tide gauge digital | 10 min. | Metric | Time Universal | Data digital | DDH PAA |