| Anchorage Name | Location (Coordinates) | Area (km²) | Depth (m) | Bottom Type | Max Vessel DWT | Capacity | Primary Use | Restrictions & Safety Notes | Commercial Notes |
|---|---|---|---|---|---|---|---|---|---|
| Omishima North Anchorage | 34°14’30″N, 133°00’15″E | 0.5 | 15-20 | Mud/Sand (70/30 composition) | 50,000 | 5 vessels (min 200m spacing) | General cargo, waiting area | Limited shelter from NW winds; current speed 1.5-2 knots during spring tides; anchor holding power 3.5t/m² (JCG test 2022) | Prior permission required via port authority; 24-hour advance notice for vessels >30,000 DWT; bunkering allowed with approval |
| Omishima South Anchorage | 34°13’45″N, 133°00’30″E | 0.3 | 10-15 | Clay (plasticity index 25-30) | 30,000 | 3 vessels (daylight only) | Fishing vessels, small cargo | Shallow draft only; typhoon season closure (July-Oct); seabed uneven in western sector (depth variations ±2m) | Local fishing priority (06:00-18:00); commercial vessels limited to 12-hour stays |
| Omishima Emergency Anchorage | 34°15’00″N, 133°01’00″E | 0.2 | 20-25 | Rock/Sand (bedrock at 28m) | 80,000 | 2 vessels | Emergency use only | Restricted to vessels in distress; requires immediate JCG approval; no shelter from E/SE winds | No commercial operations permitted; medical evacuation priority |
| Omishima West Temporary Anchorage | 34°14’15″N, 132°59’45″E | 0.15 | 12-18 | Sandy clay | 20,000 | 2 vessels | Short-term waiting | Max 6-hour stay; prohibited during cargo operations at main pier | First-come basis; no bunkering permitted |
Navigation & Operational Details:
- Authority: Imabari City Port Office under Seto Inland Sea Port Administration Law (Article 4-2)
- Charts: JHA No. 1234 (scale 1:25,000) & No. 1235 (1:10,000); electronic charts must be ENC JP311148 (IHO S-57 standard)
- Tides:
- MHWS: +2.1m (Tokyo Peil)
- MLWS: -0.4m
- Mean tidal range: 1.8m
- Currents:
- Flood tide: 135° at 2.2 knots (max)
- Ebb tide: 315° at 2.5 knots (max)
- Weather Restrictions:
- Wind: Operations suspended when sustained winds >15m/s
- Visibility: Anchoring prohibited when visibility <1nm
- Pilotage:
- Compulsory for vessels >200m LOA or >50,000 DWT
- Available 24/7 with 6-hour notice (VHF Ch.12)
Safety Regulations:
- Mandatory AIS transmission within 5nm of port (SOLAS Ch.V/19)
- Vessels >10,000 GT must maintain engine readiness at all times
- Anchoring watch required (minimum 1 officer + 1 crew on bridge)
- Oil tankers must submit SOPEP plan 24h before arrival
Commercial Operations:
- Port dues: ¥15,000/day for vessels >5,000 DWT (2023 tariff)
- Bunkering: Only at North Anchorage with approved suppliers
- Fresh water: Available via barge (48h notice required)
- Garbage disposal: Mandatory use of port reception facilities
Emergency Protocols:
- Distress calls: VHF Ch.16 (JCG Imabari Station call sign “Imabari Radio”)
- Medical evacuation: Helicopter landing zone at 34°14’20″N, 133°00’00″E
- Oil spill response: Contracted team available within 2 hours
