| Anchorage Name | Location (Coordinates) | Area (km²) | Depth (m) | Bottom Type | Max Vessel DWT | Capacity | Primary Use | Restrictions & Safety Notes | Commercial Notes |
|---|---|---|---|---|---|---|---|---|---|
| Nakanoseki Main Anchorage | 34°25’30″N 131°24’15″E | 0.8 | 15-20 (Chart Datum) | Mud/Sand (70%/30% composition per JCG seabed survey 2023) | 50,000 | 5 vessels (min 200m spacing required by Port Regulation §3.5) | Cargo/General | 1. Prohibited zone: 300m radius around submarine cables (marked on charts JCG W124). 2. Currents reach 2.5 knots during spring tides (JMA Tide Tables 2024). 3. Night anchoring requires Port Control permission (VHF Ch12, call sign “Nakanoseki Port”). 4. Mandatory AIS transmission for vessels >300 GT (Japan Maritime Safety Law Art.22). 5. Anchor watch required at all times (minimum 1 officer on bridge). |
1. Bunkering available via barge (24hr notice required, max 500T/day). 2. Fresh water supply limited to 50T/day (advance booking required). 3. No ship repair facilities available. 4. Prohibited: cargo operations during typhoon alert Level 3+ (JMA standards). 5. Waste disposal available through licensed contractors only. |
| Nakanoseki Emergency Anchorage | 34°26’00″N 131°23’45″E | 0.3 | 12-15 (Chart Datum) | Clay with scattered rocks (JCG seabed survey 2023) | 30,000 | 2 vessels (absolute maximum) | Emergency use only | 1. Strictly for vessels in distress (Japan Coast Guard Ordinance No.28 Art.5). 2. Immediate radio contact required (VHF Ch16/12). 3. Poor holding in NW winds >15 knots (JMA wind data). 4. Continuous GPS anchor drag monitoring mandatory. 5. No night use permitted except life-threatening emergencies. |
1. No commercial operations allowed. 2. No provisioning services available. 3. Vessels must vacate within 12hrs after emergency resolved. |
| Nakanoseki Temporary Holding Area | 34°24’45″N 131°24’30″E | 0.5 | 10-12 (Chart Datum) | Sandy (85% sand, 15% silt per JCG survey) | 20,000 | 3 vessels (daylight hours only) | Short-term waiting | 1. Maximum stay 48hrs (Port Regulation §4.2). 2. No bunkering/operations permitted. 3. Daylight use only (sunrise to sunset per Notice to Mariners 15/2023). 4. Vessels must maintain engine readiness. |
1. No charges apply. 2. Requires 12hr advance notice to Port Control. 3. No services available. |
| Nakanoseki Bunker Anchorage | 34°25’15″N 131°23’50″E | 0.4 | 18-22 (Chart Datum) | Firm sand (optimal holding) | 80,000 | 2 vessels (min 300m separation) | Bunkering operations | 1. Dedicated bunkering zone – other operations prohibited. 2. Firefighting equipment must be deployed during operations. 3. No simultaneous cargo operations permitted. 4. STS operations require prior approval. |
1. 24/7 bunkering available. 2. Maximum transfer rate 1,000T/hr. 3. Mandatory pre-bunkering safety meeting. |
Integrated Supplemental Data (All Previous Versions + New Additions):
1. Anchorage Technical Specifications:
– Main anchorage: 90% holding efficiency (JCG anchor test 2023), recommended 5:1 scope ratio.
– Emergency anchorage: Minimum 2:1 scope ratio required, anchor drag alarm setting at 0.1nm.
– Temporary area: Maximum 3:1 scope ratio due to limited space.
– Bunker anchorage: Special high-holding power anchors recommended.
2. Tidal & Current Data:
– Mean tidal range: 2.5m (JMA verified).
– Maximum spring tide range: 3.8m (highest recorded 4.1m in 2019).
– Tidal current: NW-SE alignment, max 2.8 knots during spring tides.
– Slack water periods: Approximately 30 minutes during turn of tide.
3. Weather Operational Limits:
– Mandatory evacuation when:
– Sustained winds >34 knots (Beaufort 8).
– Wave height >3m (NE monsoon season Dec-Feb).
– Visibility <0.5nm.
– Typhoon alert Level 2 or higher (JMA standards).
– Winter operations: Anti-icing measures required for deck equipment.
4. Navigation & Communication Protocols:
– Pilotage: Compulsory for vessels >10,000 DWT; available 24/7 with 6 hours notice.
– VTS: Continuous radar monitoring (VHF Ch12/16), AIS mandatory.
– Daylight restrictions: Vessels >200m LOA require daylight transit.
– Reporting points: Mandatory position reports at 12nm, 6nm and 1nm approaches.
5. Regulatory Compliance Requirements:
– 500m exclusion zone around naval facilities (34°25’00″N 131°25’00″E).
– No-anchor zone within 200m of aquaculture areas (marked by yellow buoys).
– Environmental protection zone: No discharge within 3nm of port.
– ISPS Code: Security Level 1 minimum, advance crew list submission required.
6. Operational Procedures:
– Turnaround time: Average 12-24 hours for cargo operations at anchorage.
– Anchoring protocol: Minimum 2 hours stabilization before cargo ops.
– Draught limitation: Max 12.5m at low tide (Port Regulation §5.3).
– Night navigation: Restricted for vessels >150m LOA.
7. Emergency Preparedness:
– Oil spill response: Contracted response team on 2hr standby.
– Medical evacuation: Helicopter medevac available (1hr notice).
– Tug assistance: 2x 50T bollard pull tugs available (30min response).
Critical Operational Notices:
1. Mandatory pre-arrival documents:
– Port Entry Notification (24hr prior)
– Crew List (Japan Immigration format)
– ISPS Declaration
2. Prohibited items:
– Anchoring without Port Control clearance
– Unauthorized bunkering operations
– Night operations without approved lighting
3. Penalties:
– Up to ¥5,000,000 for unauthorized anchorage use
– Immediate expulsion for safety violations
