{"id":1232,"date":"2026-11-05T11:37:03","date_gmt":"2026-11-05T11:37:03","guid":{"rendered":"https:\/\/regulasshipping.com\/blog\/navwarn-1336-26-sets-south-aegean-geophysical-survey-on-ng-surveyor\/"},"modified":"2026-11-05T11:37:03","modified_gmt":"2026-11-05T11:37:03","slug":"navwarn-1336-26-sets-south-aegean-geophysical-survey-on-ng-surveyor","status":"publish","type":"post","link":"https:\/\/regulasshipping.com\/blog\/navwarn-1336-26-sets-south-aegean-geophysical-survey-on-ng-surveyor\/","title":{"rendered":"NAVWARN 1336-26 sets South Aegean geophysical survey on NG Surveyor"},"content":{"rendered":"

Greece\u2019s Hellenic Navy Hydrographic Service has printed a numbered geophysical-survey warning that opens on 5 November along a 21-point line across the South Aegean, not inside yesterday\u2019s dedicated Central Mediterranean oceanographic track. The working primary retrieved this run is official NAVWARN 1336\/2026, posted on the Hydrographic Service\u2019s English navwarn board on 5 November 2026: SOUTH AIGAIO SEA GEOPHYSICAL SURVEY WILL BE CARRIED OUT BY \u2018NG SURVEYOR FROM 05 NOV 2026 IN THE LINE BETWEEN THE POINTS: 37 45 18N \u2013 023 07 12E, 37 44 00N \u2013 023 09 36E, 37 43 48N \u2013 023 11 53E, 37 41 03N \u2013 023 12 22E, 37 39 23N \u2013 023 18 43E, 37 39 53N \u2013 023 22 40E, 37 38 45N \u2013 023 25 39E, 37 35 27N \u2013 023 27 22E, 37 36 23N \u2013 023 35 45E, 37 27 10N \u2013 023 52 18E, 37 21 50N \u2013 023 59 30E, 37 16 48N \u2013 024 10 11E, 37 03 12N \u2013 024 17 21E, 37 01 02N \u2013 024 20 14E, 37 00 57N \u2013 024 25 33E, 37 04 44N \u2013 024 34 25E, 37 06 52N \u2013 024 40 05E, 37 06 27N \u2013 024 50 49E, 37 07 36N \u2013 025 02 23E, 37 12 54N \u2013 025 21 02E, 37 14 38N \u2013 025 40 47E. WIDE BERTH REQUESTED. That is Thursday morning\u2019s working Hellenic coastal instrument. It is a named-hull survey line, not a rewrite of Monday afternoon\u2019s dedicated NAVAREA III 0169\/26 Britoil Centurion, not a Myrtoo submarine-exercise box, and not a Hormuz Attack PDF.<\/p>\n

The warning is a Hellenic coastal NAVWARN. It is not NAVAREA III 0169\/26. It is not NAVAREA IX 428\/26. It is not UKMTO 196-26. This morning\u2019s dedicated IMO board remains 128 confirmed incidents as at 3 November, with 24 seafarer fatalities. Masters who brief Thursday morning as a South Aegean exclusion zone, as a completed RAM status on the NAVWARN text, as a 3\u20134 November Saronic calibration reprinted as a 21-point line, or as a Corinth Canal closure promoted onto 1336\/26 will have over-read a dotted-line survey watch. 1336\/26 tells the bridge which hull, which start date, and which 21 points to plot. It does not print a keep-clear radius, a VHF working channel, a flag, an IMO number, a cancel DTG, or a restricted-manoeuvre line. Hold the official wording, including the Hydrographic Service\u2019s printed opening quote before NG SURVEYOR and the missing close-quote on the same face.<\/p>\n

What 1336\/26 actually printed<\/h2>\n

The hydrographic text is short and is the working primary. SOUTH AIGAIO SEA. Geophysical survey will be carried out by NG SURVEYOR from 5 November 2026 in the line between the 21 points listed above. Wide berth requested. Stay with that wording. The Hydrographic Service printed neither an IMO number, an MMSI, a flag, a call sign, a wreck buoy, a least depth, a fishing or anchoring prohibition, a restricted-in-ability-to-manoeuvre line, a VHF channel, a towed-gear length, a support-tug list, daily hours, nor a cancel DTG. Do not invent a five-cable or one-nautical-mile circle around any of the 21 points. 1336\/26 does not print one. Do not invent a 15 February end date. That end belongs to dedicated 0169\/26, the Central Mediterranean Britoil Centurion track, not to this South Aegean line. Do not invent a 051600 UTC 5 November kill time. That cancel belongs to Irakleio Radio\u2019s wrap of today\u2019s dedicated 1322\/26 submarine box, not to this survey.<\/p>\n

The geometry is the first briefing fact. The 21-point line starts in the southern Saronic approaches near 37-45.3N 023-07.2E, south of Aegina and west of the Poros \/ Methana face, and runs east-southeast through 023-18E to 023-35E, then east across the South Aegean south of Kea, Kythnos, Serifos and Sifnos, south of Paros \/ Naxos, and ends near 37-14.6N 025-40.8E, west of Ikaria. That is one line, not a four-corner box. It is not a circular exclusion. It is not a TSS amendment. Saronic outbound, the Hydra \/ Spetses face, the Kythnos\u2013Serifos lane, the Paros\u2013Naxos south side and the Ikaria west approach all see a point. Do not brief a Piraeus shutdown from a survey line. Do not brief a Corinth Canal rewrite. Plot the 21 points. Keep a lookout for a named survey hull that will be restricted in practice even though 1336\/26 does not print COLREGS Rule 3(g) language.<\/p>\n

The date line is the second briefing fact. Work is printed as from 5 November 2026. No end date is printed. No daily hours are printed. No night-only or daylight-only limit is printed. No weather clause is printed. Thursday morning is already 5 November. The window is open now and stays open until a later NAVWARN cancels or amends it. A passage plan that treats 5 November as a one-day survey has under-read a line that prints no kill time. A passage plan that drops the watch after 1500 UTC because 1322\/26\u2019s Myrtoo submarine box kills itself this afternoon has applied a different number\u2019s window to this survey. 1336\/26 is a named-hull radio alert. It lives from 5 November until further notice unless a later Hellenic NAVWARN cancels it.<\/p>\n

The identification line is the third briefing fact. The Hydrographic Service named the hull. NG SURVEYOR. That is tighter than a generic \u201csurvey vessel\u201d line. It is not an IMO print. It is not a flag print. It is not a call-sign print. It is not a restricted-manoeuvre print. Open-register and AIS colour is held separately and is not a 1336\/26 fact: industry reprints this morning tagged the hull as an Italian-flag survey ship showing restricted manoeuvrability on AIS \u2014 not a NAVWARN finding, not a flag-state confirmation, and not a class survey. Do not promote an Italian flag, a RAM light, a streamer length or a DP class onto the numbered text.<\/p>\n

Industry-reprint colour, held separately: SeaLagom first carried 1336\/26 with a received stamp of 5 November 00:00 UTC and an updated stamp of 5 November 09:22 UTC, matching the Hydrographic Service\u2019s 5 November English board. The reprint restates the 21-point line, the NG SURVEYOR name, the 5 November start and the wide-berth request. Hold that as colour of the official board, not as a second survey. Dedicated 1320\/26, Saronic Gulf, calibration of subsea equipment by NG SURVEYOR on 3 and 4 November on the two-point line 37-39.67N 023-20.22E \/ 37-45.32N 023-07.22E, wide berth requested, is wrap on this hull \u2014 unused as a second NG SURVEYOR piece, and not a 1336 amendment. 1320\/26 was a two-day Saronic calibration that closed on 4 November. 1336\/26 is a 21-point South Aegean geophysical line that opens on 5 November. Do not collapse the calibration onto the survey. Do not collapse the survey onto the calibration.<\/p>\n

What this is not<\/h2>\n

This is not a rewrite of dedicated NAVAREA III 0169\/26. Monday afternoon\u2019s dedicated piece remains oceanographic work on the Britoil Centurion, IMO 9619177, MMSI 566921000, days 5 November 2026 to 15 February 2027, dotted-line groups A and B in the Central Mediterranean, wide receipt requested. 0169\/26 prints a different hull, a different sea, a different point-group and a 15 February end. 1336\/26 prints NG SURVEYOR, South Aigaio Sea, a 21-point line from 37-45.3N 023-07.2E to 37-14.6N 025-40.8E, and no end date. A DPA who briefs Thursday morning as \u201cBritoil Centurion has moved east onto 025E\u201d has borrowed 0169\/26\u2019s name and dropped the Hellenic line. Keep those numbers on their own sheets. Dedicated 0168\/26 remains weekly group 44 through 092359 UTC 9 November and still does not print 1336. A Greek coastal NAVWARN does not belong on a Spanish weekly wrapper.<\/p>\n

This is not NAVWARN 1320\/26, and it is not a 3\u20134 November Saronic calibration filed again. 1320\/26 remains wrap: Saronic Gulf, calibration of subsea equipment by NG SURVEYOR on 3 and 4 November, two points, wide berth requested. 1336\/26 is 5 November, South Aigaio Sea, geophysical survey, 21 points, wide berth requested. Two extra days, nineteen extra points and a sea-name change separate the two products. A two-day calibration in the Saronic is not a South Aegean geophysical line with no printed end. Do not brief Thursday morning as \u201c1320\/26 extended.\u201d Do not invent a 4 November cancel on 1336\/26 because 1320\/26\u2019s dates have closed.<\/p>\n

This is not NAVWARN 1322\/26, 1325\/26 or 1326\/26, and it is not a Myrtoo or Saronic firing box. Official 1322\/2026 remains Myrtoo Sea, activation of a submarine exercise area, 5 November 2026 from 0500Z until 1500Z, four corners 36-55.00N 023-05.00E \/ 36-55.00N 023-20.00E \/ 37-12.00N 023-05.00E \/ 37-12.00N 023-20.00E, avoid crossing \u2014 wrap this run, unused as dedicated; the box sits south of 1336\/26\u2019s western points and kills itself at 1500 UTC today. Official 1325\/26 remains Ydra firing-practice area, live firing, 5 November from 0600Z to 1000Z, four corners around 37-00N 023-18E \u2014 wrap, window already past at this 11:30 UTC run. Official 1326\/26 remains Megara Gulf, practice area Diaporia, underwater firing 5 November from 1500Z to 2000Z, four corners 37-50.00N 023-10.00E \/ 37-50.00N 023-22.00E \/ 37-56.30N 023-22.00E \/ 37-56.30N 023-10.00E, avoid crossing \u2014 wrap, opens after this file. 1336\/26 prints none of those boxes and none of those avoid-crossing lines. A survey line with a wide-berth request is not a submarine box and not a live-firing box. Do not convert 1336\/26 onto 1322\/26 because both sit in the South Aegean today.<\/p>\n

This is not NAVWARN 1324\/26, and it is not a Corinth Canal closure. Official 1324\/2026 remains Korinthiakos Gulf, Korinthos Canal, transiting prohibited due to maintenance works from 03 November 2026 04:00Z until further notice \u2014 wrap, unused as dedicated. 1336\/26 does not print the canal, does not print a closure, and does not print a 2027 reopen. A DPA who briefs Thursday morning as \u201cthe canal is closed, therefore the South Aegean survey is the diversion route\u201d has borrowed 1324\/26\u2019s prohibition and dropped the 21-point line. Keep the canal on its own sheet. Do not promote a 2027 operator-aim colour line onto 1336\/26.<\/p>\n

This is not 1314\/26, and it is not RN GAIA BLU. Official 1314\/26 remains a South Aegean geophysical survey from 2 November until further notice by RN GAIA BLU inside a four-corner box in Greek territorial sea around 36-28N 025-14E to 37-00N 026-01E \u2014 wrap, a different hull and a different box. 1336\/26 names NG SURVEYOR and prints a 21-point line, not a territorial-sea box and not GAIA BLU. Two South Aegean surveys are two surveys. Do not collapse them.<\/p>\n

This is not UKMTO 196-26, not this morning\u2019s dedicated 797\/26 Mentor, and not IMO\u2019s 128-count. Thursday morning\u2019s dedicated 196-26 remains a Verified Attack on an unnamed tanker 50 nautical miles north of Madinat ash Shamal. This morning\u2019s dedicated 797\/26 remains unmanned tanker Mentor, IMO 9340374, 43-25.1N 028-37.0E, east of Cape Kaliakra; official English on hs-navy.mod.bg has now taken that number \u2014 wrap on the Black Sea file. IMO remains 128 confirmed \/ 24 dead as at 3 November. NAVAREA IX still ends at 428\/26. A South Aegean survey line does not belong on that tape.<\/p>\n

Operational implications<\/h2>\n

For a master already shaping a Piraeus\u2013Syros, Piraeus\u2013Naxos, Lavrion\u2013Paros, Hydra \/ Spetses coastal, Kythnos\u2013Serifos, or Ikaria west-approach passage from 5 November, Thursday morning is a CPA and lookout problem before it is a security rewrite. The Hydrographic Service named the hull and printed a 21-point line, not a circle. The western end sits in the southern Saronic, on the doorstep of the Poros \/ Methana face and the Hydra approaches. The eastern end sits west of Ikaria, south of the Mykonos\u2013Ikaria lane. A passage plan that only budgeted 0169\/26\u2019s Central Mediterranean dotted line, or that treated the South Aegean as clean because 1322\/26\u2019s submarine box kills itself at 1500 UTC, has not budgeted a named survey ship that is on the water today. Survey gear in the water, even when a NAVWARN is silent on RAM status, is a close-quarters and fishing-gear problem. Give the hull a wide practical berth. Do not pass between the ship and unmarked gear. Do not assume AIS will show streamers, buoys or a towed array. Do not assume night work is off because hours were not printed.<\/p>\n

The same-day exercise split is the operational content a DPA has to get right. 1322\/26 still tells the bridge to avoid a Myrtoo submarine box through 1500 UTC today. 1326\/26 still tells the bridge to avoid Diaporia underwater firing from 1500 UTC to 2000 UTC today. 1325\/26\u2019s Ydra live-firing window has already closed. 1336\/26 is none of those boxes. It is a moving hull on a long line with a wide-berth request and no printed end. A passage plan that only plotted the four-corner submarine box, or that treated 1500 UTC as an all-clear for the South Aegean, has not budgeted NG SURVEYOR. Charterers asking whether \u201cthe Aegean is closed for a submarine exercise until 1500 UTC\u201d will not be answered by this file. What arrived is a survey line that outlives this afternoon\u2019s boxes, not a firing-box all-clear.<\/p>\n

1320\/26, used only as wrap, is the local reminder that this hull was already working a short Saronic calibration on 3 and 4 November. That colour does not amend 1336\/26. It does tell a master inbound to Piraeus, Lavrion, Poros or Hydra not to treat the 21-point line as a paper exercise. If the hull is encountered, COLREGS Rule 18 and a practical wide berth apply whether or not the NAVWARN printed RAM. Report actual close-quarters, gear in the water, or an unlit hull to JRCC Piraeus and to the company security officer. Logging 1336\/26 is not a substitute for a sighting report. 1324\/26\u2019s canal closure remains a separate routing fact for hulls that would otherwise have used Corinth; it is not a 1336\/26 diversion order.<\/p>\n

Keep the dedicated files on their own lines. 0169\/26 remains Monday afternoon\u2019s dedicated Britoil Centurion Central Mediterranean track through 15 February 2027. 0168\/26 remains Monday afternoon\u2019s dedicated weekly group 44 through 092359 UTC 9 November. 1322\/26, 1325\/26, 1326\/26 and 1324\/26 remain wrap. 1320\/26 remains wrap on this hull\u2019s 3\u20134 November calibration. 1314\/26 remains wrap on RN GAIA BLU. This morning\u2019s dedicated 797\/26 remains Mentor east of Cape Kaliakra; official English has now taken it. This morning\u2019s dedicated 790\/26 remains two drifting containers east of Maslen Nos. Thursday morning\u2019s dedicated 196-26 remains the Qatar tanker Attack. IMO remains 128 \/ 24 as at 3 November. UKMTO now ends at 196-26. NAVAREA IX still ends at 428\/26. Do not recast 5 November morning as a South Aegean exclusion zone, as a 0169 rewrite, as a 1320 extension, as a canal-closure diversion, or as a completed 1322 all-clear.<\/p>\n

What Operators Should Note<\/h2>\n