Tyrrhenian Sea
IHO sea area 28e · 9° to 16° E, 38° to 44° N
- in force
- 0
- last 12 months
- 4
- archive messages
- 862
- categories
- 16
What the archive shows
862 messages are recorded since 1997-01-20 for the Tyrrhenian Sea. The selection uses the IHO sea area; a message may describe an exercise, equipment outage or continuing operation as well as a hazard report.
Nav aids accounts for 219 of 862 recorded messages (25%), the largest category group in this selection.
The NGA historical archive froze in 2024-05; live collection began 2026-08-17. Counts around that gap are incomplete, and changes in reporting volume do not establish changes in incident frequency.
In force now · 0
Nothing in force in this sea right now.
By year
By month (all years)
By category · available archive
| Nav aids | 219 | 25% |
| Exercises | 182 | 21% |
| Surveys | 111 | 13% |
| Incidents | 108 | 13% |
| Ordnance | 57 | 7% |
| Cable ops | 51 | 6% |
| Other | 46 | 5% |
| Derelicts | 34 | 4% |
| Containers | 16 | 2% |
| Wrecks | 11 | 1% |
| Quakes | 9 | 1% |
| Debris | 8 | 1% |
| Towing | 6 | 1% |
| Restricted | 2 | 0% |
| Missiles | 1 | 0% |
| Spills | 1 | 0% |
Archive · 862 cancelled
- HYDROLANT 998/99 · Exercises1999-05-17 → 1999-05-21Gunnery exercises 0400Z to 1500Z daily 18 thru 21 may within six miles of 38-19N 013-23E
- HYDROLANT 961/99 · Nav aids1999-05-12 → 1999-08-13Forte stella light 42-48.9N 010-20.1E unlit
- HYDROLANT 902/99 · Exercises1999-05-04 → 1999-05-24Gunnery exercises 0600Z to 1530Z daily 04 thru 07, 10 thru 11, 17 thru 21 and 26 may in area bound by 40-00N…
- HYDROLANT 895/99 · Surveys1999-05-04 → 1999-05-05Underwater operations 050700Z to 051800Z may within one mile of 43-59-00N 009-55-30E
- HYDROLANT 840/99 · Nav aids1999-04-27 → 1999-05-03Ecueil de perduto light 41-22N 009-19E unlit
- HYDROLANT 780/99 · Nav aids1999-04-20 → 1999-04-21Isola del tino light 44-01.6N 009-51.0E unlit
- HYDROLANT 748/99 · Exercises1999-04-16 → 1999-04-23Gunnery exercises 0600Z to 1530Z daily 19 thru 23 apr in area bound by 40-38N 009-54E, 41-00N 010-45E,…
- HYDROLANT 739/99 · Nav aids1999-04-15 → 1999-04-17Capo comino light 40-31.7N 009-49.7E unlit
- HYDROLANT 659/99 · Exercises1999-04-05 → 1999-04-30Gunnery exercises 0700Z to 1630Z daily 06 thru 09, 12 thru 16, 19 thru 23, and 26 thru 30 apr in area bound…
- HYDROLANT 627/99 · Surveys1999-04-01 → 1999-04-09Research operations 060700Z to 092000Z apr by M/V alliance towing array in area bound by 43-51N 009-47E,…
- HYDROLANT 581/99 · Surveys1999-03-24 → 1999-04-13Underwater operations in progress until further notice by M/V strakhov vicinity 40-46N 012-46E
- HYDROLANT 559/99 · Nav aids1999-03-22 → 1999-04-30Viareggio light 43-51.7N 010-14.8E unlit
- HYDROLANT 552/99 · Nav aids1999-03-21 → 1999-08-20Capo spartivento light 38-52.6N 008-50.7E unlit
- HYDROLANT 534/99 · Nav aids1999-03-18 → 1999-04-09Punta sottile light 37-56N 012-16E unlit
- HYDROLANT 499/99 · Nav aids1999-03-12 → 1999-05-26Cape milazzo light 38-16N 015-14E unlit
- HYDROLANT 491/99 · Exercises1999-03-11 → 1999-03-31Gunnery exercises 0700Z to 1630Z daily except saturdays and sundays until 31 mar in area bound by 40-00N…
- HYDROLANT 431/99 · Exercises1999-03-03 → 1999-03-19Gunnery exercises 0700Z to 1630Z daily 03 thru 05, 08 thru 12, and 15 thru 19 mar in area bound by 40-15N…
- HYDROLANT 422/99 · Ordnance1999-03-01 → 1999-03-03Underwater ordnance detonations 030500Z to 031500Z mar within 2000 yards of 43-59.0N 009-55.5E
- HYDROLANT 408/99 · Exercises1999-02-27 → 1999-03-02Gunnery exercises 010700Z to 011100Z and 021100Z to 021600Z mar in area bound by 43-53N 009-46E, 43-55N…
- HYDROLANT 403/99 · Nav aids1999-02-26 → 1999-03-09Cape milazzo light 38-16.1N 015-13.9E unlit
Sea boundaries: Flanders Marine Institute (2018), IHO Sea Areas v3, marineregions.org (CC BY 4.0). Not for navigation — follow official NAVAREA / coastal broadcasts.