Italy’s coastal NAVTEX circuit has now printed a numbered submarine-operations box that is live this morning in the southern Gulf of Taranto, not a reprint of Saturday morning’s dedicated Zakynthos firing window and not a second Drapano FORACS check. The working primary retrieved this run is English coastal warning 527/26, received on the industry coastal board at 09:50 UTC on 8 November and updated 16:12 UTC the same day: COASTAL WARNING 527/26 NOV 02 NORTHERN IONIAN SEA TARANTO GULF. FROM 090500Z NOV 26 TO 092359Z NOV 26 IN: ZONE SIERRA 733 ALFABRAVODELTA ZONE BOUNDED BY THE FOLLOWING POINTS: 39-34.00N 017-00.00E / 39-34.00N 017-38.00E / 39-20.00N 017-38.00E / 39-15.500N 017-25.000E / 39-15.500N 017-11.000E / 39-24.500N 017-11.000E. WILL BE CARRIED OUT MILITARY ACTIVITIES WITH SUBMARINE OPS. ANCORAGE, FISHING AND OTHER UNDERWATER ACTIVITIES ARE PROHIBITED. (BROADCAST VALID 08 NOV 2026 1130 TO 09 NOV 2026 2330 ITALIAN TIME.) Official wording keeps ANCORAGE, ALFABRAVODELTA and the NOV 02 serial on the header. That is Monday morning’s working Italian coastal instrument. It is a one-day six-point box with a printed submarine-ops sentence, not a rewrite of dedicated Kerkyra 201/26, not a Tango 833 light-smoke file, and not a Hormuz Attack PDF.
The warning is an Italian coastal NAVTEX product. It is not NAVAREA III 0169/26. It is not NAVAREA IX 433/26. It is not UKMTO 200-26. Friday afternoon’s dedicated IMO board remains 129 confirmed incidents as at 6 November, with 25 seafarer fatalities. Masters who brief Monday morning as a Taranto port closure, as a completed torpedo-firing order on a submarine-ops sentence, as Saturday’s Zakynthos box moved west onto Calabria, or as overnight coastal 537/26’s Tango 833A gunfiring promoted onto Sierra 733 will have over-read a timed keep-out. 527/26 tells the bridge which named zone, which six points, which 090500Z–092359Z window and which three prohibitions to plot. It does not print a keep-clear radius outside the polygon, a VHF working channel, a hull, an IMO number, a RAM line, or a CANCEL THIS MSG DTG beyond the printed 092359Z 9 November kill. Hold the official wording, including “military activities with submarine ops,” the printed ANCORAGE spelling, and “fishing and other underwater activities are prohibited.”
What 527/26 actually printed
The hydrographic text is short and is the working primary. Coastal warning 527/26. Northern Ionian Sea, Taranto Gulf. From 090500Z 9 November 2026 to 092359Z 9 November 2026 in zone Sierra 733 ALFABRAVODELTA, the six-point zone bounded by the coordinates listed above. Military activities with submarine ops will be carried out. Anchorage, fishing and other underwater activities are prohibited. Broadcast valid 08 November 2026 1130 to 09 November 2026 2330 Italian time. Stay with that wording. The coastal station printed neither a hull name, an IMO number, an MMSI, a flag, a pennant, a submarine class, a weapon type, a wreck buoy, a least depth, a restricted-in-ability-to-manoeuvre line, a VHF channel, a numeric harbour berth, a keep-clear radius outside the polygon, nor a “CANCEL THIS MSG” DTG. Do not invent a five-cable or one-nautical-mile halo around the polygon. 527/26 does not print one. Do not invent a 13 November end date. That last day belongs to dedicated Kerkyra 201/26’s Zakynthos firing and to dedicated 1342/26’s Drapano FORACS window, not to this one-day Taranto box. Do not invent a 130830 UTC kill. That cancel belongs to 201/26, not to 527/26.
The geometry is the first briefing fact. The six-point box sits in the southern Gulf of Taranto, well south of the Taranto harbour face. North wall 39-34.00 N. South wall 39-15.500 N. West wall 017-00.00 E, stepping in to 017-11.000 E on the southwestern face. East wall 017-38.00 E, stepping in to 017-25.000 E on the southeastern face. That is on the order of 18 nautical miles north–south by about 29 nautical miles east–west, not a circular exclusion and not a TSS amendment. The Calabrian east coast around Ciro / Punta Alice sees the western corners. The open gulf toward the Salento face sees the eastern corners. Taranto itself sits on the order of 40-28 N, more than 50 nautical miles north of this north wall. Do not brief a Taranto shutdown from a southern-gulf box. Do not brief a Crotone harbour rewrite. Plot the six points. Stay out of the polygon from 0500Z to 2359Z on 9 November for anchorage, fishing and underwater work. Transit is not printed as prohibited. Do not convert a three-activity ban into a closed gulf.
The date line is the second briefing fact. Work is printed as from 090500Z to 092359Z on 9 November 2026. No 8 November window is printed as closed. No 10 November extension is printed. No weather clause is printed. Monday morning is 9 November. The box opens at 0500Z, about ninety minutes after this 0330 UTC desk, and remains live through 2359Z tonight. A passage plan that treats 8 November as already closed in Sierra 733 has under-read a box that opens at 0500Z on 9 November. A passage plan that treats 9–13 November as a Taranto shutdown has borrowed dedicated 201/26’s five-day Zakynthos tape and overnight 537/26’s four-day Tango 833A gunfiring. A passage plan that drops the watch after 1600Z because “Italian coastal firings are daylight-only” has under-read a 0500Z–2359Z window. 527/26 is a numbered radio alert. It lives from 0500Z on 9 November through 2359Z on 9 November unless a later Italian coastal warning cancels or amends it. 0500Z in November is 0600 Central European Time. 2359Z is 0059 CET on 10 November. The broadcast-valid line, 1130 Italian time on 8 November to 2330 Italian time on 9 November, is the NAVTEX transmission window, not a second operations clock. Do not invent a 0700–1300 UTC Romanian firing window on this box.
The instruction line is the third briefing fact. Anchorage, fishing and other underwater activities are prohibited. That is tighter than a “navigate with caution” sentence and looser than dedicated 1342/26’s “crossing above this area is prohibited.” The coastal station printed submarine ops as the reason. It did not print “torpedo,” “mine,” “gunnery,” “missile,” or a named hull. Do not convert a submarine-ops box into overnight 537/26’s gunfiring-with-helicopter sentence because both landed on the 8 November Italian board. Do not convert it into 536/26’s light-smoke-colour signals because both sit in the Gulf of Taranto. Give the six points, the 0500Z–2359Z window and the three prohibitions. Do not occupy 39-24 N, 017-20 E at 1400 UTC on 9 November as an anchorage because “Taranto is open.”
Industry-reprint colour, held separately: SeaLagom first carried 527/26 with a received stamp of 09:50 UTC on 8 November and an updated stamp of 16:12 UTC the same day, restating the six-point Sierra 733 ALFABRAVODELTA box, the 090500Z–092359Z window, the submarine-ops sentence and the three prohibitions. Hold that as colour of the English coastal product, not as a second submarine piece. Same-board wrap unused as dedicated this run: coastal warning 536/26, Tango 833 Alfa zone, launch of light-smoke colour and surface activity signals, split local-time windows 9–13 November, eight-point box around 40-16 N to 40-10 N, 017-30 E to 017-12 E, naval units to avoid hindering the exercise; and coastal warning 537/26, a fresh 8 November afternoon product, Tango 833A, gunfiring military activity with helicopter, 9–12 November split local-time windows, transit, fishing, anchorage and other underwater activities prohibited, same eight-point Tango box. Those Tango 833 products sit on the order of 40-16 N, about 40 nautical miles north of Sierra 733’s north wall. Two zones. Do not collapse 536/26 or 537/26 onto 527/26. Do not collapse 527/26 onto Tango 833.
What this is not
This is not a rewrite of dedicated Kerkyra 201/26, and it is not the Zakynthos firing moved into the Gulf of Taranto. Saturday morning’s dedicated Hellenic piece remains: IONIAN SEA. Activation of firing practice area ‘ZAKYNTHOS’. Live firing by the Slovenian Air Force from 9 until 13 November 2026, 0630–0730 UTC daily plus 0930–1045 UTC on 9, 10 and 12 November and 1045–1200 UTC on 11 November, four-point box 37-38.6N 020-00.4E / 37-20.1N 020-59.5E / 36-53.2N 020-56.6E / 37-19.4N 019-58.2E, avoid crossing, cancel 130830 UTC 13 November. That box sits west of Zakynthos, two degrees east and two degrees south of Sierra 733. 9 November is the first Zakynthos morning and the only Sierra 733 day. A master shaping the wider Ionian this Monday may owe both: 201/26’s live-firing box west of the island, and 527/26’s submarine-ops box in the southern Taranto Gulf. Do not brief Monday morning as “201/26 became a submarine.” Do not drop 201/26 because 527/26 exists. Do not invent a 0630–0730 UTC overlay on 527/26 because 201/26 prints one.
This is not coastal warning 536/26, and it is not a Tango 833 light-smoke file filed again. 536/26 remains wrap: Tango 833 Alfa, eight points from 40-16.500N 017-30.000E to 40-10.00N 017-30.00E, launch of light-smoke colour and surface activity signals, split local-time windows 9–13 November, naval units to pay attention and avoid hindering the exercise. Official wording on that file keeps ACTIVITITE. That box sits off the Taranto / Cape San Vito face, about 40 nautical miles north of Sierra 733. Light-smoke signals are not submarine ops. Do not brief Monday morning as “536/26 moved south.” Do not apply 536/26’s 13 November last evening to 527/26. Do not apply 527/26’s 2359Z kill to Tango 833.
This is not coastal warning 537/26, and it is not a completed Tango 833A gunfiring naming. 537/26, received 14:54 UTC on 8 November, remains wrap, unused as dedicated: NORTHERN IONIAN SEA TARANTO GULF. Gunfiring military activity with helicopter in Tango 833A, 08.00–12.00 LT and 16.30–18.30 LT on 9, 11 and 12 November, 08.00–16.00 LT and 16.30–18.30 LT on 10 November, transit, fishing, anchorage and other underwater activities prohibited. Same eight-point Tango box as 536/26. 537/26 is a four-day harbour-face gunfiring product. 527/26 is a one-day southern-gulf submarine-ops product. Do not collapse the gunfiring onto Sierra 733. Do not collapse Sierra 733 onto Tango 833A. Do not invent a helicopter sentence on 527/26 because 537/26 printed one. Do not invent a transit prohibition on 527/26 because 537/26 printed one.
This is not dedicated NAVWARN 1342/26, and it is not a Drapano FORACS box converted into a submarine. Saturday’s dedicated Hellenic piece remains: CRETAN SEA. CRETE ISLAND. DRAPANO POINT. FORACS checks, 9–13 November, 0600Z–1600Z each day, eight-point box around 35-28 N 024-20 E, crossing prohibited. That box sits two seas east. 9 November is the first Drapano morning and the only Sierra 733 day. Do not brief Monday morning as “FORACS moved to Taranto.” Do not invent a 0600Z–1600Z overlay on 527/26.
This is not this morning’s other dedicated file, Irakleio 1404/26, and it is not a Kobi Ruegg survey. 1404/26 remains the southeast Cretan Sea fiber-optic track, ‘KOBI RUEGG’, 7–11 November, 2 NM safety distance, cancel 112200 UTC 11 November. A southern Taranto submarine box is not a Cretan Sea survey line. Keep those numbers on their own sheets.
This is not last night’s dedicated JMIC Update 112, not Sunday morning’s dedicated 199-26 or 200-26, and not Saturday night’s dedicated 198-26. Update 112 remains the 177-count note, ICOD 081300 UTC 8 November, first JMIC naming of HUDA against dedicated 198-26. 199-26 remains the tanker fire 8 NM northwest of Khasab. 200-26 remains the outbound Hormuz projectile. 198-26 remains the bulk carrier 18 NM east of Khor Fakkan. IMO remains 129 confirmed / 25 dead as at 6 November. A Taranto Gulf submarine box does not belong on that tape.
This is not dedicated NAVWARN 813/26, and it is not a Varna boarding box. Last night’s dedicated Bulgarian piece remains: SOUTH OF CAPE GALATA, boarding operations 0230–0700 UTC 12 November, four corners around 43-07 N 027-56 E. Official English 814/26 remains wrap on that file: VARNA LAKE, boarding 0200–0700 UTC 12 November, centre 43-11.65 N 027-50.80 E, radius 3 cables. Dedicated 799/26 remains Varna port and road, 0500–0900 UTC 10 November and 0800–1200 UTC 13 November. Those are Black Sea harbour products. They do not belong on Sierra 733.
Operational implications
For a master already shaping a Taranto, Crotone, Gallipoli, Santa Maria di Leuca or southern-gulf passage today, Monday morning is a timed keep-out problem before it is a security rewrite. The coastal station printed a six-point Sierra 733 ALFABRAVODELTA box, named submarine ops, named 090500Z–092359Z 9 November, and named a ban on anchorage, fishing and other underwater activities. A three-activity prohibition under a bounded-zone sentence is a closed polygon for ships that would otherwise anchor, fish or put divers or ROVs in the water. It is not AIS-optional. It is not a Taranto port closure. It is not 201/26’s live-firing box west of Zakynthos. It is not 537/26’s Tango 833A gunfiring, which additionally prohibits transit. A passage plan that only budgeted Saturday’s Zakynthos hours, or that treated the Gulf of Taranto as clean because 536/26 is a light-smoke notice, has not budgeted a one-day submarine-ops box that opens at 0500Z this morning. Give the polygon. Do not anchor, fish or put underwater plant inside it through 2359Z tonight. Do not treat a missing transit ban as permission to stop in 39-24 N, 017-20 E.
The 9 November Ionian tape is the operational content a DPA has to get right. Dedicated 201/26 still tells the bridge to avoid a Zakynthos live-firing box in split morning hours through 13 November. 527/26 tells the bridge not to anchor, fish or work underwater inside Sierra 733 through 2359Z tonight. Wrap 536/26 still tells naval units not to hinder light-smoke signals in Tango 833 Alfa on split local-time windows through 13 November. Wrap 537/26, unused as dedicated, still tells the bridge that Tango 833A prohibits transit, fishing, anchorage and underwater work in split local-time windows through 12 November. Dedicated 1342/26 still tells the bridge not to cross the Drapano polygon 0600Z–1600Z through 13 November. Dedicated 1409/26 still tells the bridge that Plateia fires on 9 and 16 November, 0400–1700 UTC. A passage plan that only plotted “the Ionian is on firing this week” has not budgeted a southern Taranto submarine box, a Zakynthos live-firing box, a Tango 833 harbour-face pair, a Cretan FORACS box and a Saronic Plateia day on the same calendar Monday. Charterers asking whether “Taranto is closed for a submarine exercise” will not be answered by this file. What arrived is a southern-gulf three-activity ban that dies at 2359Z tonight, not a harbour-master closure.
Taranto, Crotone, Gallipoli and Santa Maria di Leuca remain open on this text. 527/26 does not print a harbour-master closure, a pilot-boarding amendment, or a VHF working channel for the range. Hulls that would otherwise have anchored on the southern-gulf banks inside 39-34 N, 017-00 E to 017-38 E today need a berth outside the polygon, or a passage that does not stop. Do not invent a 24-hour transit ban. Do not invent a 2 NM halo north of 39-34 N. Plot the north wall. Stay out of the polygon for the three printed activities through 2359Z. Report actual submarine activity, an unlit hull, or a close-quarters situation to IMRCC Rome and to the company security officer. Logging 527/26 is not a substitute for a sighting report.
A night transit after 1600Z is not a printed all-clear. 527/26’s window runs to 2359Z. It does not print 0000–0500 UTC as a safe window, and it does not print RAM-off at sunset. Give the printed prohibitions through 2359Z. Do not linger inside the polygon as if the notice had printed a working corridor. Do not treat Taranto Roads as closed unless the harbour master says so. Watch a later Italian coastal warning that moves a point, adds a hull, a weapon class, a radius or a transit ban, or extends past 092359Z 9 November.
Keep the dedicated files on their own lines. Kerkyra 201/26 remains Saturday morning’s dedicated Zakynthos firing through 130830 UTC 13 November. Irakleio 1409/26 remains Saturday morning’s dedicated Plateia windows on 9 and 16 November. NAVWARN 1342/26 remains Saturday’s dedicated Drapano FORACS box through 13 November. Last night’s dedicated 813/26 remains the Cape Galata boarding box on 12 November. Official English 814/26 remains wrap on 813/26. Dedicated 799/26 remains the Varna port-and-road closure on 10 and 13 November. Wrap 536/26 and wrap 537/26 remain unused as dedicated Tango 833 products. This morning’s other dedicated file remains Irakleio 1404/26. IMO remains 129 confirmed / 25 dead as at 6 November. UKMTO still ends at dedicated 200-26 on the Attack line, dedicated 199-26 on the Suspicious Activity line, and dedicated 198-26 on the Advisory line. JMIC still ends at dedicated Update 112. NAVAREA IX still lists 433/26 as the in-force list. Do not recast 9 November morning as a Taranto exclusion zone, as a Zakynthos rewrite, as a Tango 833 conversion, as a 13 November shutdown, or as a completed 537/26 gunfiring naming.
What Operators Should Note
- Log 527/26 as a one-day Sierra 733 submarine-ops box, not as a Zakynthos rewrite and not as a Tango 833 conversion. English coastal warning 527/26, Northern Ionian Sea, Taranto Gulf. From 090500Z to 092359Z 9 November 2026. Zone Sierra 733 ALFABRAVODELTA. Six points: 39-34.00N 017-00.00E / 39-34.00N 017-38.00E / 39-20.00N 017-38.00E / 39-15.500N 017-25.000E / 39-15.500N 017-11.000E / 39-24.500N 017-11.000E. Military activities with submarine ops. Anchorage, fishing and other underwater activities are prohibited. Broadcast valid 08 November 2026 1130 to 09 November 2026 2330 Italian time. Official wording keeps ANCORAGE, ALFABRAVODELTA and the NOV 02 serial. The warning names neither hull, IMO, VHF, keep-clear radius outside the polygon, RAM status, transit ban nor a CANCEL THIS MSG DTG. SeaLagom first carried the text at 09:50 UTC on 8 November, updated 16:12 UTC. Replace nothing in the 201/26 folder; add this number on the Taranto Gulf sheet.
- Plot the six-point box, not a single circle and not a Taranto closure. North wall 39-34.00 N. South wall 39-15.500 N. West wall 017-00.00 E, stepping in to 017-11.000 E. East wall 017-38.00 E, stepping in to 017-25.000 E. On the order of 18 by 29 nautical miles in the southern Gulf of Taranto, more than 50 nautical miles south of the Taranto harbour face. Calabrian east-coast, Crotone northbound, Gallipoli westbound and the open-gulf lane all see a corner. Do not brief a port shutdown. Do not drop the north wall because the next port is Taranto. Do not convert the three-activity ban into 537/26’s transit prohibition.
- Hold the 9 November window and the 0500Z–2359Z hours. The box opens at 0500Z this morning. First operations morning is 9 November, not 8 November. Kill is 092359Z 9 November, not 13 November and not 130830 UTC. Do not treat 8 November as already closed in Sierra 733. Do not treat 9–13 November as a Taranto shutdown. Do not apply 201/26’s 0630–0730 UTC hours to this number. Do not apply 536/26’s 13 November last evening to this number. Watch a later Italian coastal warning that moves a point, adds a hull, a weapon class, a radius or a transit ban, or extends past 2359Z tonight.
- Carry 536/26 and 537/26 as wrap, not as 527/26 facts. Coastal warning 536/26 remains wrap: Tango 833 Alfa, light-smoke colour and surface activity signals, split local-time windows 9–13 November, eight-point box around 40-16 N 017-20 E, unused as dedicated. Coastal warning 537/26, a fresh 8 November afternoon product, remains wrap: Tango 833A, gunfiring with helicopter, 9–12 November split local-time windows, transit/fishing/anchorage/underwater work prohibited, unused as dedicated. Those Tango 833 boxes sit about 40 nautical miles north of Sierra 733. Do not collapse either onto 527/26. Do not invent a helicopter, a light-smoke signal or a transit ban on Sierra 733.
- Carry the 9 November Ionian overlap, then kill each notice on its own clock. 527/26: no anchorage, fishing or underwater work inside Sierra 733 through 2359Z tonight. Dedicated 201/26: Zakynthos live firing, split morning hours 9–13 November, cancel 130830 UTC 13 November. Dedicated 1409/26: Plateia, 0400–1700 UTC on 9 and 16 November. Dedicated 1342/26: Drapano FORACS, 0600Z–1600Z 9–13 November. Wrap 536/26 and 537/26 remain the Tango 833 harbour-face pair. Do not merge the submarine box onto the Zakynthos firing or onto Tango 833. Do not drop 201/26 because 527/26 exists.
- Hold the Black Sea, Cretan Sea and Hormuz tape on their own sheets. This morning’s other dedicated file remains Irakleio 1404/26, ‘KOBI RUEGG’, 2 NM, through 112200 UTC 11 November. Last night’s dedicated 813/26 remains the Cape Galata boarding box on 12 November; official English 814/26 remains wrap. Dedicated 799/26 remains Varna port and road on 10 and 13 November. Dedicated 199-26 remains the Khasab tanker fire. Dedicated 200-26 remains the outbound Hormuz projectile. Dedicated 198-26 remains the Khor Fakkan bulk carrier. JMIC remains dedicated Update 112, 177 incidents, ICOD 081300 UTC 8 November. IMO remains 129 / 25 as at 6 November. UKMTO still ends at 200-26. Official Cyprus 345/26, NAVAREA III 0170/26 and NAVAREA IX 433/26 remain unused as dedicated. Sightings of submarine activity, an unlit hull or a close-quarters situation go to IMRCC Rome and to the CSO; 527/26 itself prints no VHF working channel.
Regulas Shipping will keep lining coastal warning 527/26 against Saturday morning’s dedicated Kerkyra 201/26 and against wrap 536/26 and 537/26 so operators can treat Monday’s Taranto Gulf tape as a 9 November Sierra 733 submarine-ops box with a 0500Z–2359Z anchorage, fishing and underwater-work ban, not as a Zakynthos rewrite, a Tango 833 conversion, or a Taranto port closure.
