Bulgaria’s Navy Hydrographic Service has now printed an official boarding-operations box south of Cape Galata, not a reprint of Saturday afternoon’s dedicated Varna port-and-road closure and not a second diving window on the same four corners. The working primary is the English in-force board on hs-navy.mod.bg, which now starts at NAVWARN 814/26 and then carries NAVWARN 813/26: SOUTH OF CAPE GALATA. NAVAL EXERCISE. BOARDING OPERATIONS FM 0230 TO 0700 UTC ON 12 NOV 2026, IN REGION : 43-07.983 N 027-56.316 E / 43-07.983 N 027-57.416 E / 43-05.983 N 027-57.217 E / 43-05.983 N 027-55.416 E. PROHIBITED FOR NAVIGATION, ANCHORING, FISHING, DIVING, AND ANY TYPE OF UNDERWATER ACTIVITY. Official English has taken 813. This morning’s unused folder correctly left SeaLagom 813/26 unused until that board moved. Industry coastal reprints and SeaLagom carry the same four corners, the same 0230–0700 UTC 12 November window and the same prohibition list, first seen 09:44 UTC on 8 November. Official English and the industry reprint agree on the box and on the boarding tag. That is the product.
That is the working primary. Sunday night’s product is a one-window naval-exercise boarding box south of Cape Galata, not a rewrite of Saturday afternoon’s dedicated 799/26 Varna port-and-road closure, not a reprint of wrap 812/26’s diving operations on the same four corners, and not a conversion of Thursday morning’s dedicated unmanned-tanker file on Mentor onto a Galata harbour box. It names south of Cape Galata. It names naval exercise. It names boarding operations. It names 0230–0700 UTC on 12 November 2026. It names four corners. It names a prohibition on navigation, anchoring, fishing, diving and any type of underwater activity. It does not name a hull. It does not name an IMO number, a weapon class, a VHF working channel, a numeric berth, a keep-clear in cables, or a cancel DTG beyond the printed window. Saturday afternoon’s dedicated 799/26 remains Varna port and Varna road, 0500–0900 UTC on 10 November and 0800–1200 UTC on 13 November. Wrap 812/26 remains diving operations, 110900–111600 UTC and 120900–121600 UTC November, same four corners, temporarily prohibited. Thursday morning’s dedicated 797/26 remains unmanned tanker Mentor, IMO 9340374, at 43-25.1 N 028-37.0 E. Those products sit on different clocks. Masters who brief Sunday night as a Varna harbour move onto Galata, as wrap 812/26 converted into a boarding, as Mentor moved west, or as a standing closure of the Bulgarian coast will have merged a 4.5-hour boarding box onto three other series.
What the warning actually printed
The hydrographic text is short and is the working primary. NAVWARN 813/26. South of Cape Galata. Naval exercise. Boarding operations from 0230 to 0700 UTC on 12 November 2026, in region: 43-07.983 N 027-56.316 E, 43-07.983 N 027-57.416 E, 43-05.983 N 027-57.217 E, 43-05.983 N 027-55.416 E. Prohibited for navigation, anchoring, fishing, diving, and any type of underwater activity. Stay with that wording. The Hydrographic Service printed a cape tag. It printed naval exercise. It printed boarding operations. It printed one clock window. It printed four coordinates. It printed a prohibition list. It did not print a hull name. It did not print an IMO number, an MMSI, a flag, a call sign, or a pennant number. It did not print “missile,” “gunnery,” “mine,” “torpedo,” or “submarine.” It did not print a radius in cables. It did not print a VHF channel, a NOTAM number, or a harbour-master berth. It did not print a wreck buoy. It did not print a cancel DTG of the form CANCEL THIS MSG. The 0230–0700 UTC window is the live clock. Do not invent a five-cable or one-nautical-mile halo around the box. 813/26 prints the four corners as the prohibited region. Do not invent a 10–13 November daily boarding because wrap 807/26 and wrap 808/26 print cutter 231 across those days. Do not invent a 0900–1600 UTC overlay from wrap 812/26. Give the four corners. Give 0230–0700 UTC 12 November. Give the prohibition list.
The geometry is the first briefing fact. The four corners sit south of Cape Galata, on the order of 43-07 N, 027-56 E, on the seaward face of the Varna approaches, not inside Varna Lake and not on Thursday morning’s dedicated Mentor plot at 43-25.1 N 028-37.0 E. The box is compact, on the order of two nautical miles north–south by about one nautical mile east–west. Wrap 812/26 prints the same four corners as a diving box. Official 814/26, wrap on this file, is a different geometry: Varna Lake, boarding operations, 0200–0700 UTC on 12 November, region WITN center 43-11.65 N 027-50.80 E, radius 3 cables. Official wording keeps WITN. Hold 43-11.65 N, not a 42-11.65 slip on one industry feed line. Saturday afternoon’s dedicated 799/26 names Varna port and Varna road and prints no polygon. 813/26 is none of those. Plot the four corners. Keep them prohibited for navigation, anchoring, fishing, diving and underwater activity inside 0230–0700 UTC on 12 November. Do not occupy 43-07 N 027-56 E as an overflow anchorage during those hours. Do not treat Kavarna, Balchik, Kaliakra, Burgas, Constanta or Midia as closed because a Galata boarding box is prohibited for four and a half hours on 12 November. Do not treat Varna port as closed by 813/26; that harbour instrument remains dedicated 799/26 on 10 and 13 November.
The clock is the second briefing fact. Official English prints 0230–0700 UTC on 12 November. That is one discrete 4.5-hour window, not a continuous 10–13 November shutdown and not wrap 812/26’s two diving days. A passage plan that treats the Galata face as closed from 0230 UTC on 10 November through 1600 UTC on 13 November has joined 799/26, 812/26, 813/26 and the cutter-231 wraps into a 79-hour fiction. A passage plan that only carries 12 November 0900–1600 UTC because wrap 812/26 already occupies that morning has dropped the boarding window that opens at 0230 UTC, six and a half hours before the diving window. A passage plan that only carries 10 and 13 November because dedicated 799/26 already occupies those mornings has merged a port-and-road closure onto a seaward boarding box. Hold 0230–0700 UTC 12 November. Do not invent a 0200 UTC start from wrap 814/26. Do not invent a 0900 UTC start from wrap 812/26. Do not invent a night window as a hydrographic all-clear; 813/26 does not print 0000–0230 UTC as a safe corridor, and it does not print the hours after 0700 UTC as a numbered all-clear of the same four corners either. What it prints is the boarding prohibition. Wrap 812/26 still occupies those corners 0900–1600 UTC on 12 November. Two products, one box, two clocks.
The missing hull, weapon, radius, VHF and cancel-DTG lines are omissions, not a completed boarding order. Official English 814/26 on the same board prints boarding operations in Varna Lake, 0200–0700 UTC on 12 November, three-cable radius, same prohibition list. Wrap 812/26 prints diving operations on these four corners, 11 and 12 November, 0900–1600 UTC. Wrap 807/26 prints hydrographic cutter 231 east of Cape Galata, 0600–1500 UTC 10–13 November, four-corner prohibited box, RAM on outboard and autonomous underwater equipment. Wrap 808/26 prints cutter 231 again, Varna Bay, 0630–1415 UTC 10–13 November, three-cable distance. Those are wrap, unused as dedicated except that 814/26 sits as wrap on tonight’s 813/26 rather than as a second dedicated boarding piece. They do not amend 813/26 into a lake radius, a diving window, or a cutter survey. Do not restore a weapon class onto a boarding sentence. Do not invent Channel 16 as a range-safety net. Do not invent a numeric berth in Varna East or Varna West. Give the cape, the boarding tag, the window, the four corners, and the prohibition list.
The industry first-seen stamp is 09:44 UTC on 8 November, with an 11:05 UTC update on the SeaLagom card. Official English now leads. Do not wait on a later Bulgarian-language reprint before logging the Galata boarding box. Do not treat the 11:05 UTC industry update as a coordinate move; the English body retrieved tonight still names the same four corners and still names 0230–0700 UTC on 12 November. This morning’s unused folder held 813/26 until official hs-navy.mod.bg took it. Sunday night is the dedicated conversion, not a restatement of that unused hold.
What this is not, and the same-coast hydrographic colour
This is not a rewrite of NAVWARN 814/26, and it is not Varna Lake moved seaward. Official English now starts at 814/26: VARNA LAKE. NAVAL EXERCISE. BOARDING OPERATIONS FM 0200 TO 0700 UTC ON 12 NOV 2026, IN REGION WITN CENTER: 43-11.65 N 027-50.80 E, AND RADIUS 3 CBLS. PROHIBITED FOR NAVIGATION, ANCHORING, FISHING, DIVING AND ANY TYPE OF UNDERWATER ACTIVITY. Official wording keeps WITN. Hold 43-11.65 N. That lake disc sits west of Cape Galata, inside the Varna Lake / Beloslav system, on a three-cable radius. 813/26 names neither Varna Lake nor 43-11.65 N. 814/26 is wrap on tonight’s 813/26, unused as a second dedicated boarding piece. A master shaping Varna Lake at 0200 UTC on 12 November still owes 814/26 a three-cable prohibited disc. A master shaping 43-07 N 027-56 E at 0230 UTC still owes 813/26 the four-corner box. Those can be the same morning. They are not the same product. Do not brief Sunday night as “the lake boarding opened on Galata.” Do not apply 814/26’s three cables to 813/26. Do not apply 813/26’s four corners to the lake.
This is not a rewrite of NAVWARN 812/26, and it is not the Galata diving box converted into a boarding. Wrap 812/26 remains: BLACK SEA. BULGARIA. SOUTH OF CAPE GALATA. NAVAL EXERCISE. DIVING OPERATIONS FROM 110900 UTC TO 111600 UTC AND 120900 UTC TO 121600 UTC NOV 2026 IN AREA BOUND BY the same four corners, area temporarily prohibited for navigation, anchoring, fishing, diving and underwater activities. Saturday afternoon correctly left 812/26 as wrap on dedicated 799/26. Sunday night does not promote it. 813/26 is boarding, 0230–0700 UTC, 12 November only. 812/26 is diving, 0900–1600 UTC, 11 and 12 November. Same corners. Different activity. Different clocks. A 12 November overlap is not a merger: 813/26 occupies 0230–0700 UTC; 812/26 occupies 0900–1600 UTC. Do not brief Sunday night as “812 became a boarding.” Do not drop 812/26 because 813/26 exists. Do not invent a 0230–1600 UTC shutdown of the box.
This is not a rewrite of NAVWARN 799/26, and it is not Varna port closed on 12 November. Saturday afternoon’s dedicated piece remains: Varna Bay, navy training, 0500–0900 UTC on 10 November and 0800–1200 UTC on 13 November, Varna port and Varna road temporarily prohibited for manoeuvring, entrance and exit, swimming, anchoring, sports, entertainment, tourism and diving. 799/26 names neither Cape Galata nor 43-07.983 N. 813/26 names neither the port nor the road. A 12 November boarding box is not a third harbour window. Do not brief Sunday night as “799 added 12 November.” Do not drop 799/26 because 813/26 exists. Hold 10 and 13 November on the port. Hold 12 November 0230–0700 UTC on the Galata box.
This is not a rewrite of NAVWARN 797/26, and it is not Mentor moved onto Galata. Thursday morning’s dedicated Bulgarian piece remains: unmanned tanker Mentor, IMO 9340374, 43-25.1 N 028-37.0 E, 1435 UTC 4 November, drifting south three knots, without lights, no crew, increased caution, report MRCC-Varna on visual contact. That plot sits on the order of 30 nautical miles east-northeast of tonight’s box. 813/26 names neither Mentor nor 43-25.1 N. Do not brief Sunday night as “the unmanned tanker is now a boarding box.” Do not drop 797/26 because 813/26 exists.
This is not a rewrite of NAVWARN 808/26 or 807/26, and it is not cutter 231. Wrap 808/26 remains hydrographic cutter 231, hydrological expedition, 0630–1415 UTC from 10 to 13 November, three-cable distance, Varna Bay. Wrap 807/26 remains cutter 231 east of Cape Galata, 0600–1500 UTC 10–13 November, four-corner prohibited box around 43-10.5 N 028-00 E, RAM on outboard and autonomous underwater equipment. Those cutter products are not 813/26. Do not invent cutter 231, a three-cable berth, or RAM onto a boarding prohibition that prints none of those lines. Dedicated 777/26 remains cutter 331, now past 061600 UTC 6 November.
This is not a rewrite of NAVWARN 789/26, and it is not Akademik unlit on Galata. Wednesday night’s dedicated piece remains: research vessel Akademik, 0500 UTC 4 November to 1700 UTC 30 November, internal waters and territorial sea of Bulgaria, CTD sampling, keep a safety distance of 1 NM from the vessel. 813/26 prints neither Akademik nor a one-nautical-mile ship berth. Do not apply 789/26’s mile to the four-corner box.
Same-board wrap, unused as dedicated this run and not an 813/26 amendment except as already stated for 814/26 and 812/26: official English 800/26, mine countermeasure, 0700–1000 UTC 10 November, within five cables of 43-10.1 N 028-03.8 E. 801/26, mine countermeasure, 0630–1500 UTC 10 November, six corners east of Cape Galata. 802/26, mine countermeasure, 0800–1300 UTC 10–12 November, five corners south of Cape Galata. 803/26, mine countermeasure, 0700–1300 UTC 10–12 November, four corners south of Cape Galata. 804/26 and 805/26, artillery firing, 1000–1330 UTC 10 November, east of Cherny Nos. 806/26, navy training, night boxes southwest of Cape Kaliakra, 10–13 November. 809/26, gunnery, 110500–110800 UTC, southwest of Cape Kaliakra. 810/26 and 811/26, mine countermeasures, 11–13 November, southwest of Cape Kaliakra. Carry 813/26 as the Galata boarding instrument. Carry 800–812 and 814 as wrap on this file, not as a second dedicated Varna piece and not as a weapon class restored onto 813/26.
This is not a rewrite of ARN 166/26, ARN 167/26, ARN 164/2026 or ARN 168/26. This week’s dedicated Romanian 166/26 remains real firing, 12 and 13 November, 0700–1300 UTC, seven corners around 44-21 N 028-52 E, prohibited area to navigation, cancel 131400 UTC 13 November. Friday afternoon’s dedicated 167/26 remains a 9 November 20 km training circle at 44-02.80 N 030-35.20 E, cancel 092130 UTC 9 November. Wednesday night’s dedicated 164/2026 remains real firing, 11 and 12 November, 0700–1200 UTC, four corners around 43-50 N 028-59.5 E, cancel 121300 UTC 12 November. Saturday morning’s dedicated 168/26 remains F/V SEA ANGEL 1, MOB, 13.12 UTC 6 November, 44-11.68 N 028-43.60 E. Those are Romanian products. 813/26 does not print 44-21 N, 44-02.80 N, 43-50 N or 44-11.68 N. A 12 November overlap of clocks is not a merger: 164/2026 occupies 43-50 N 0700–1200 UTC; 166/26 occupies the Midia heptagon 0700–1300 UTC; 813/26 occupies 43-07 N 0230–0700 UTC. Three states, three instruments. Do not brief Sunday night as “the Midia box opened on Galata.”
This is not Sunday morning’s dedicated Kerkyra 201/26, not Sunday morning’s dedicated Irakleio 1409/26, and not Saturday night’s dedicated HNHS 1343/26. 201/26 remains the 9–13 November Zakynthos firing box. 1409/26 remains Plateia firing on 9 and 16 November. Dedicated 1343/26 remains the Fournoi firing through 081500Z 8 November, now past this 2330 UTC desk. Official HNHS 1338/26, 1339/26 and 1351/26 remain unused unlit lights. Official Irakleio 1404/26 remains unused as dedicated. Official Cyprus 345/26 remains unused as dedicated. This is also not tonight’s companion JMIC Update 112, not this morning’s dedicated UKMTO 199-26 or 200-26, and not Friday night’s dedicated NAVAREA IX 432/26, now past 082359 UTC 8 November. Those are Hormuz and Southern Gulf products. They do not belong on a Galata boarding notice.
Operational implications
For a master running the Varna approaches, the Galata face, or a 12 November arrival at Varna, Sunday night is a 4.5-hour prohibited-box problem on four printed corners before it is a war-risk rewrite. Official English named south of Cape Galata, named boarding operations, named 0230–0700 UTC on 12 November, named 43-07.983 N 027-56.316 E and three other corners, and named a prohibition on navigation, anchoring, fishing, diving and underwater activity. A prohibited four-corner box under a boarding-operations sentence is a live keep-clear for ships that would otherwise cut that face on a dawn approach, even when the Hydrographic Service has not printed a hull, a VHF channel or a cancel DTG. It is not AIS-optional. It is not a closed Black Sea. It is not 799/26’s port-and-road closure. A passage plan that only carried Saturday afternoon’s two harbour windows, or that treated 12 November as empty because 799/26 prints 10 and 13 November, has not budgeted a seaward boarding box that opens at 0230 UTC.
The 12 November tape is the operational content. 813/26 occupies the four-corner box 0230–0700 UTC. Wrap 814/26 occupies Varna Lake 0200–0700 UTC, three cables from 43-11.65 N 027-50.80 E. Wrap 812/26 occupies the same four corners 0900–1600 UTC, diving. Dedicated 799/26 occupies Varna port and road 0500–0900 UTC on 10 November and 0800–1200 UTC on 13 November. Wrap 807/26 and 808/26 occupy cutter 231 0600–1500 UTC and 0630–1415 UTC from 10 to 13 November. Dedicated 164/2026 occupies 43-50 N 0700–1200 UTC on 12 November. Dedicated 166/26 occupies the Midia heptagon 0700–1300 UTC on 12 and 13 November. A master who only plots one “Varna notice” for next week has under-read a Galata boarding, a lake boarding, a diving overlay, two harbour windows, a cutter survey, and two Romanian firing boxes. Charterers who still treat the western Black Sea as a quiet alternative to Hormuz now have a named 12 November boarding box on the Galata approaches, a still-open 799/26 harbour closure on 10 and 13 November, a still-open Mentor watch at 43-25.1 N, and a still-open Akademik mile through 30 November. Deviation language that treats 813/26 as a closed Varna will have misread a 4.5-hour seaward box. War-risk underwriters will ask for the 813/26 number, the official English take, the four corners, the 0230–0700 UTC sentence, the missing hull, and a written statement that this notice is not 799/26, not wrap 812/26, not wrap 814/26, and not 797/26.
The same-corner overlap on 12 November is the operational content a DPA has to get right. 813/26 occupies 0230–0700 UTC. Wrap 812/26 occupies 0900–1600 UTC. The gap 0700–0900 UTC is not a printed working corridor and is not a numbered all-clear; it is simply the hour and a half between two different prohibitions on the same corners. Do not occupy 43-07.983 N 027-56.316 E as a waiting area between the boarding and the diving. Do not treat 2 NM from the box as permission to cross wrap 814/26’s lake disc. Do not treat the lake disc as permission to cross the Galata box.
A night transit south of Galata on 11 November is not a printed all-clear for 12 November. 813/26 prints 12 November only. It does not print 0000–0230 UTC as a safe window, and it does not print RAM-off at 0700 UTC. Give the printed box. Do not linger on the four corners as if the notice had printed a working corridor. Do not treat Varna, Balchik or Kavarna as closed unless those authorities say so on their own instruments. Watch a later NAVWARN that moves a corner, adds a hull or a radius, or extends past 0700 UTC 12 November.
Keep the dedicated files on their own lines. NAVWARN 799/26 remains Saturday afternoon’s dedicated Varna port-and-road closure on 10 and 13 November. NAVWARN 797/26 remains Thursday morning’s dedicated Mentor watch. NAVWARN 789/26 remains Akademik through 1700 UTC 30 November. Official English 814/26 remains wrap on tonight’s 813/26. Wrap 812/26 remains the Galata diving overlay. Wrap 800/26 through 811/26 remain wrap on dedicated 799/26. ARN 166/26 remains the Midia heptagon on 12 and 13 November. ARN 164/2026 remains the 43-50 N avoid box on 11 and 12 November. ARN 167/26 remains the 9 November 20 km circle. ARN 168/26 remains SEA ANGEL 1. Tonight’s companion Update 112 remains the Hormuz / Gulf of Oman JMIC note. Dedicated 199-26 and 200-26 remain this morning’s unnamed Khasab fire and unnamed outbound Hormuz projectile. Dedicated 432/26 is now past 082359 UTC 8 November. IMO remains 129 confirmed / 25 dead as at 6 November. Do not recast 8 November night as a harbour rewrite, as a diving conversion, as Mentor moved west, or as a closed western Black Sea.
What Operators Should Note
- Log 813/26 as a 12 November boarding box south of Cape Galata, not as a Varna port rewrite. Official English NAVWARN 813/26, now on the hs-navy.mod.bg in-force board under 814/26. SOUTH OF CAPE GALATA. NAVAL EXERCISE. BOARDING OPERATIONS FM 0230 TO 0700 UTC ON 12 NOV 2026. Four corners 43-07.983 N 027-56.316 E / 43-07.983 N 027-57.416 E / 43-05.983 N 027-57.217 E / 43-05.983 N 027-55.416 E. Prohibited for navigation, anchoring, fishing, diving, and any type of underwater activity. The notice names neither hull, IMO, weapon class, radius, VHF, numeric berth, keep-clear in cables nor a CANCEL THIS MSG DTG. This morning’s unused folder left SeaLagom 813/26 unused until official English took it. This is not 799/26, not wrap 812/26, not wrap 814/26, and not 797/26.
- Hold the four corners and the 0230–0700 UTC window, not a 10–13 November shutdown. Compact box south of Cape Galata, on the order of 43-07 N 027-56 E, seaward of Varna roads. Dedicated 799/26 remains Varna port and Varna road, 0500–0900 UTC 10 November and 0800–1200 UTC 13 November. Wrap 812/26 remains diving on these same corners, 0900–1600 UTC 11 and 12 November. Do not join 0230–0700 UTC onto 812/26’s 0900–1600 UTC as a 0230–1600 UTC closure. Do not treat Varna, Balchik, Kavarna, Kaliakra, Burgas, Constanta or Midia as closed. Do not occupy the box as an overflow anchorage at 0230 UTC on 12 November.
- Carry 814/26 as wrap, not as 813/26 facts. Official English 814/26, top of the board: VARNA LAKE, boarding operations, 0200–0700 UTC 12 November, WITN center 43-11.65 N 027-50.80 E, radius 3 cables, same prohibition list. Official wording keeps WITN. Hold 43-11.65 N, not a 42-11.65 slip. Unused as a second dedicated boarding piece. Do not apply three cables to the Galata box. Do not apply the four corners to the lake. A 12 November 0200 UTC lake window and a 0230 UTC Galata window can both be live. They are not one harbour closure.
- Carry the 12 November Black Sea overlap, then kill each notice on its own clock. 813/26: Galata boarding, 0230–0700 UTC. Wrap 814/26: Varna Lake boarding, 0200–0700 UTC. Wrap 812/26: Galata diving, 0900–1600 UTC. Dedicated 164/2026: 43-50 N avoid box, 0700–1200 UTC. Dedicated 166/26: Midia heptagon, 0700–1300 UTC. Wrap 807/26 / 808/26: cutter 231, 10–13 November. Do not merge the boarding onto the diving, onto the lake, onto the port, or onto the Romanian firing boxes. Do not drop 799/26 because 813/26 exists.
- Hold Mentor, Akademik, the cutter wraps and the Hormuz tape on their own sheets. NAVWARN 797/26 remains MENTOR at 43-25.1 N 028-37.0 E. NAVWARN 789/26 remains Akademik, 1 NM, through 1700 UTC 30 November. Wrap 800/26 through 811/26 remain wrap on dedicated 799/26. Dedicated 777/26 remains cutter 331, past 061600 UTC 6 November. Tonight’s companion Update 112 remains the 081300 UTC JMIC note. Dedicated 199-26 remains this morning’s unnamed Khasab fire. Dedicated 200-26 remains this morning’s unnamed outbound Hormuz projectile. Dedicated 432/26 is now past 082359 UTC 8 November. IMO remains 129 confirmed / 25 dead as at 6 November. Official HNHS 1338/26, 1339/26 and 1351/26 remain unused unlit lights. Official Cyprus 345/26 remains unused as dedicated. Sightings still go to the CSO; 813/26 itself prints no VHF working channel.
- Do not recast Sunday night as a closed western Black Sea. Official English has taken 813. The box is four corners, 4.5 hours, 12 November. Watch a later NAVWARN that moves 43-07.983 N 027-56.316 E, adds a hull or a radius, prints a cancel DTG, or extends past 0700 UTC 12 November — not a headline that Galata shut Varna for the week.
Regulas Shipping will keep lining Sunday night’s official 813/26 Galata boarding box at 43-07.983 N, 027-56.316 E against Saturday afternoon’s dedicated 799/26 Varna port-and-road closure and against wrap 812/26’s diving overlay on the same four corners so operators can treat 12 November as a 4.5-hour prohibited boarding window, not as a harbour rewrite, a diving conversion, or a closed western Black Sea.
