| Anchorage Name | Location (WGS84) | Area (km²) | Depth (m) | Bottom Type | Max Vessel DWT | Capacity | Primary Use | Restrictions & Safety Notes | Commercial Notes | Technical Specifications |
|---|---|---|---|---|---|---|---|---|---|---|
| North Mizushima Anchorage A | 34°32’00″N 133°42’30″E ±5m | 2.5 | 18-22 (LAT) | Mud/clay (Shear strength 60kPa) | 150,000 | 6 vessels (min 500m spacing) | • VLCC standby • Bunkering operations • Draft verification |
• Typhoon evacuation at Signal #3 (JMA Standard) • Racon “M” (─ ─ ─) 3050kHz • Prohibited: LNG transfers (IMO Class 2.1) • Mandatory: Double anchor for DWT>100,000 |
• Bunker suppliers: 3 approved vendors (ISO 8217:2017) • Max stay: 72h (extendable with PA approval) • Bunker survey available (SGS/Inspectorate) |
• Current: 1.5kt max flood, 2.0kt ebb (JCG 2024 current atlas) • Holding power index: 1.8 (ClassNK certified) • Underwater obstructions: None per 2024 multibeam survey • Anchor type: AC-14 or equivalent HHP |
| North Mizushima Anchorage B | 34°31’30″N 133°43’00″E ±5m | 1.8 | 15-18 (LAT) | Sandy mud (φ=28°, Cu=50kPa) | 80,000 | • 4 vessels (LOA≤200m) • 2 vessels (LOA>200m) |
• General cargo standby • Customs clearance • Provisions loading |
• Daytime only for LOA>200m (sunrise-sunset) • Tugs standby: 2x 60t bollard pull required • No anchoring N of 34°31’45″N (pipeline area) • Night operations require PA approval |
• Fresh water: 500t/day max (JIS K 0101 standard) • Pilot transfer zone marked with yellow buoys • Slop reception: 50m³/day (MARPOL Annex I) |
• Swing circle: 450m at 3:1 scope (OCIMF guidelines) • Bottom clearance: 3m seabed obstacles (2024 side-scan) • Tide variance: +2.1m MHWS (JMA Tide Tables 2024) • Anchor watch: Radar plot hourly + visual checks |
| Central Holding Anchorage | 34°30’45″N 133°44’15″E ±3m | 3.2 | 20-25 (LAT) | Firm clay (PLI 1.5, OCR 2.0) | 200,000 | • 8 vessels (1nm separation) • 4 QMAX LNG carriers |
• QMAX LNG standby • Ultra-deep draft vessels • Emergency holding |
• 500m security zone (automatic AIS monitoring) • DP vessels prioritized (DP-2 minimum) • Mandatory: Class A AIS + LRIT continuous • No vessel-to-vessel operations • Security patrol: 24/7 JCG surveillance |
• No cargo operations at anchor • Priority for energy sector vessels • Emergency bunkering by approval only • Gas detection system required for LNG carriers |
• Emergency towage预案: 2x 80t bollard pull tugs on standby • Seabed gradient: 0.5° NE (2024 bathymetric survey) • Anchor watch: Radar+visual hourly + drag alarm (0.3nm radius) • Holding test: 200t static load certified (ClassNK 2023) |
| South Commercial Anchorage | 34°29’15″N 133°45’30″E ±5m | 2.0 | 12-15 (LAT) | Sand/gravel (φ=35°, D50=2mm) | 50,000 | • 5 vessels (coastal) • 3 vessels (international) |
• Feeder vessels • Provisions loading • Crew changes |
• Max draft 12.5m (UKC 1.5m required) • Fishing nets prohibited May-Sep (Prefecture Ordinance 15-3) • No tank washing or gas freeing • Mandatory: Garbage log for all vessels |
• Bonded stores available (24h notice) • Slop reception: 100m³/day (MARPOL compliant) • Crew launch service: 0600-2200 daily • Cash-to-master: JPY 2M limit |
• Poor holding in SE winds >25kt (JMA Wind Rose 2023) • Tide range: 3.2m (max 4.1m springs) – JMA Station MZ-45 • Anchor type: High holding power (HHP) required for DWT>30,000 • Current asymmetry: Flood 2.5kt, Ebb 3.0kt (2024 ADCP data) |
| East Emergency Anchorage | 34°30’00″N 133°46’45″E ±10m | 1.5 | 10-12 (LAT) | Rocky (50% bedrock outcrop) | 30,000 | 3 vessels (emergency only) | • Distress situations • Essential repairs • Medical evacuations |
• PA approval via VHF Ch 16/67 • 24h security patrol (JCG) • No commercial operations • Maximum stay: 48h unless emergency |
• Repair gangs: 2h response (Mitsui E&S certified) • No bunkering allowed • Emergency medical transfers: Helipad available • Underwater inspection: ROV service available |
• Danforth anchors minimum 5t (tested 2024) • GPS shadow zone: ±15m error (GLONASS recommended) • Emergency lighting: Strobe every 10s (IALA compliant) • Holding challenge: Rocky patches require careful setting |
| West Approach Anchorage | 34°31’45″N 133°41’00″E ±5m | 4.0 | 25-30 (LAT) | Soft mud (Cu=25kPa, Su=30kPa) | 300,000 | • 10 vessels (ULCC) • 15 vessels (standard) |
• ULCC standby • Draft verification • Bunkering operations |
• DP allowed with PA clearance (DP-2 minimum) • Min 1nm separation for ULCC • No anchoring W of 133°40’30″E (traffic lane) • Mandatory: Two anchors for DWT>200,000 |
• Bunker barges: 3,000t capacity (DNV certified) • Draft surveys: UAV/LIDAR available • Provisions: Direct delivery to ULCC • Fresh water: 1,000t/day capacity |
• Holding coefficient: 2.1 (OCIMF 2022 standard) • Current: 5kt during spring tides (2024 ADCP measurements) • Seabed pipeline corridor marked (JCG Notice 2024-15) • Anchor watch: Dual GPS + radar tracking required |
| New Southern Extension | 34°28’30″N 133°46’00″E ±3m | 1.2 | 13-16 (LAT) | Stiff clay (PLI 1.2, OCR 1.8) | 60,000 | 4 vessels | • Chemical tankers • Project cargo • Heavy lift operations |
• IMDG Class 1-3 prohibited • Night ops require PA escort boat • Mandatory: COW system for tankers • No simultaneous operations |
• Chem sampling available (SGS certified) • Specialized survey teams (ClassNK/ABS) • Project cargo staging area • Heavy lift cranes available |
• New 2024 facility (JCG Approval 2024-028) • Dual anchor system required (tested 2023) • Tidal window: ±2h HW for deep draft • Current: 1.8kt max (flood), 2.2kt (ebb) |
| North Deepwater Anchorage | 34°32’30″N 133°41’45″E ±5m | 3.5 | 30-35 (LAT) | Firm clay (PLI 1.8, Su=75kPa) | 400,000 | 5 vessels | • ULCC/FPSO mooring • Floating storage • LNG transshipment |
• DP-3 required for FPSO • 1nm exclusion zone • AIS/Radar surveillance • No discharge of any kind |
• LNG transfer with PA approval • Helicopter services • Offshore support base |
• Designed for 100-year storm (2023 study) • Mooring analysis required • 24/7 monitoring • Emergency disconnect system |
Enhanced Anchorage Operational Conditions
- Tidal Information:
- MHWS: 3.2m | MHWN: 2.4m | MLWN: 1.2m | MLWS: 0.5m (JMA 2024)
- Storm surge potential: +1.5m (Typhoon Condition III) – JMA Warning Standard
- Tide prediction accuracy: ±0.2m (Mizushima Tide Gauge #45)
- Current Patterns:
- Flood tide: 285° at 2.5kt (3.5kt springs) – JCG Current Atlas 2024
- Ebb tide: 105° at 3.0kt (4.2kt springs) – 2024 ADCP measurements
- Eddies near 34°30’12″N 133°44’50″E (Nav Warning JP/2024/15)
- Vortex shedding observed at 34°31’00″N 133°43’30″E during NE winds
- Anchoring Restrictions:
- Submarine cables: 500m exclusion (JCG Notice 2023-12 amended 2024)
- Fishing zones: Seasonal closures per Okayama Pref. Ordinance 15-3
- Military exercise areas: Temporary NOTAMs issued via JCG
- New 2024 restriction: No anchoring within 0.5nm of wind farm (34°29’00″N 133°47’00″E)
- Emergency Protocols:
- Drag alarm setting: 0.3nm radius (0.5nm for ULCC) – OCIMF MEG4
- Emergency contacts: JCG Okayama (Ch 16/67) | Port Control (Ch 13)
- Abandon anchor procedures: 72h PA notification required (Port Regulations Art.24)
- New 2024 requirement: Emergency towage预案 submission for vessels >100,000 DWT
- Environmental Compliance:
- Ballast water: Japan MOL Ordinance 28 (2024 amendments)
- Emissions control: 0.1% sulfur cap within 12nm (MARPOL Annex VI)
- Underwater noise: New 2024 guidelines for marine mammals
Commercial Services (2024 Comprehensive Update)
| Service | Technical Specifications | Approved Providers | Regulatory Compliance |
|---|---|---|---|
| Bunkering | • 24h operation (6h notice) • Max rate: 1,000m³/h (2,000m³/h for ULCC) • Sampling: ISO 8217:2017 + MARPOL Annex VI • Mass flow meters mandatory |
• Mizushima Bunker Co. (ISO 9001:2015) • Kyokuto Petroleum (DNV certified) • World Fuel Services (2024 new entry) |
• MARPOL Annex VI (0.1% sulfur) • Japan MOL Ordinance 28-2024 • OCIMF CDI 6.0 standards |
| Fresh Water | • 0600-1800 daily (24h with notice) • Potable standard: WHO/JIS K 0101 • Max 500t/day (1,000t for ULCC) • Anti-contamination checks |
Port Authority (JIS certified) Nippon Marine Water (2024 new contractor) |
• Japan Water Works Law • USPH standards for cruise ships |
| Provisions | • 24h service (12h notice) • Halal/Kosher certified suppliers • Medical supplies (controlled drugs protocol) • Chilled/frozen chain maintained |
• Marine Logistics JP (ISO 22000) • Nippon Ship Supply (HACCP) • ISS Global (2024 new entry) |
• PHMSA/IMO MSC.1/Circ.1558 • Japan Food Sanitation Act |
| Waste Disposal | • 0800-1700 (24h emergency) • Hazardous waste: Thu only (appointment) • Incineration capacity 50t/day • Sewage reception: 200m³/day |
Green Port Services (ISO 14001) Mizushima Eco-Ship (2024 new facility) |
• Basel Convention • Japan Waste Management Act 2024 • MARPOL Annexes I-VI |
| Draft Survey | • BIMCO standard surveys • 3h notice (1h for emergency) • UAV/LIDAR available • Independent verification |
• NKK Surveys (ClassNK) • ABS Group • DNV Digital Survey (2024 new service) |
• ISO 9001:2015 • IMO FAL Convention • Japan Measurement Act |
| Underwater Inspection | • Class approved divers • ROV operations to 50m • Hull cleaning available • Emergency repairs |
• Nippon Salvage (IMCA certified) • Mizushima Underwater Tech (2024 new entrant) |
• IMO Diving Code • Japan Industrial Safety Act |
