| Anchorage Name | Location (Coordinates) | Area (km²) | Depth (m) | Bottom Type | Max Vessel DWT | Capacity | Primary Use | Restrictions & Safety Notes | Commercial Notes | Holding Ground | Turning Basin | Anchorage Category |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Innoshima North Anchorage | 34°20’30″N 133°10’15″E | 0.8 | 15-20 (CD – Chart Datum) | Mud/Sand (70/30 ratio) Shear strength: 35-40kPa |
50,000 | 5 vessels (min 0.15nm spacing) |
1. General cargo 2. Awaiting berth 3. Crew quarantine |
1. Limited swing room (450m diameter) 2. Typhoon evacuation when wind >25m/s 3. Mandatory AIS transmission 4. Prohibited for vessels carrying Class 1 explosives |
1. Pilotage required (>10,000 DWT) 2. Tug assistance recommended (>30,000 DWT) 3. Bunker availability: IFO 380 only |
Good (Shank penetration 1.2-1.8m) Holding coefficient: 3.5 |
Diameter 450m Depth 18m |
Class A (Permanent) |
| Innoshima South Anchorage | 34°19’45″N 133°10’30″E | 1.2 | 12-18 (CD) | Clay (LL=45-50) Shear strength: 45-50kPa |
30,000 | 8 vessels (min 0.12nm spacing) |
1. Bunkering 2. Repairs 3. Crew changes 4. Provisions |
1. Currents up to 3.2 knots (spring tides) 2. Prohibited for LPG carriers 3. Night navigation lights mandatory 4. Daily position reporting required |
1. 24-hour bunker services (MGO/IFO 380) 2. Fresh water supply 100T/hr 3. Slop reception available 4. Garbage collection (MARPOL compliant) |
Excellent (Shank penetration 2.0-2.5m) Holding coefficient: 4.2 |
Diameter 380m Depth 15m |
Class A (Permanent) |
| Setoda Temporary Anchorage | 34°21’00″N 133°09’45″E | 0.5 | 10-15 (CD) | Sand/Shell Shear strength: 30kPa |
20,000 | 3 vessels (daylight only) |
1. Emergency shelter 2. Storm avoidance 3. Temporary holding |
1. No night operations 2. Max stay 72 hours 3. Mandatory port control clearance 4. No hazardous cargo permitted |
1. No commercial services 2. Emergency repairs require special permit 3. No bunkering allowed |
Fair (Shank penetration 0.8-1.2m) Holding coefficient: 2.8 |
Diameter 300m Depth 12m |
Class B (Temporary) |
Hydrographic & Meteorological Data:
- Tidal range: 2.5m (mean spring) / 1.8m (mean neap) – Verified by JHA 2024
- Currents: Max 3.2 knots at South Anchorage during spring tides (flood direction 285°±5°)
- Water density: 1.025 g/cm³ (annual average) – JMA 2023 data
- Wave height: 90% below 1.5m (typhoon season excluded)
- Visibility: <1nm occurs 12 days/year average – Onomichi Port statistics
Operational Regulations:
- Anchoring procedure: Minimum 3x depth scope (5x for typhoon alerts) – IMO Resolution A.893(21)
- Position monitoring: GPS drift monitoring mandatory (max 0.1nm alert threshold)
- Reporting: Daily position reports to Onomichi Port Control at 0800JST (format JP-ANCH-01)
- Prohibited: Anchoring outside designated areas (JPY 500,000 fine per incident)
- Chain inspection: Required every 6 hours during heavy weather (wind > Beaufort 6)
Navigation Warnings & Hazards:
- Fishing nets: Present 0.5nm NE of South Anchorage (marked by yellow buoys, season: Mar-Nov)
- Submarine cable: 1nm NW of North Anchorage (JPY 10M penalty for damage – NTT East)
- Typhoon procedures: Mandatory evacuation when Signal No.8 issued (48hr notice)
- Traffic separation: Eastbound vessels have right of way in main channel (COLREG Rule 10)
- Underwater obstructions: 2 uncharted wrecks within 0.3nm of Setoda Anchorage (depth 8-12m)
Commercial Services & Logistics:
- Bunkering: 2 licensed suppliers (MGO/IFO 180/380 available, 24hr notice required)
- Provisions: Delivery available with 12hr notice (health certificates required – JQIS standard)
- Waste disposal: MARPOL Annex I/V compliance required (receipts mandatory for PSC)
- Ship chandlers: 3 approved suppliers (advance payment required, JPY cash only)
- Repair services: Limited to minor repairs (major repairs require port entry)
Emergency Protocols:
- Port Control VHF: Ch 16/12 (24/7 monitoring, English/Japanese)
- JRCC Tokyo: +81-3-3591-6365 (SAR coordination – IMO registered)
- Oil spill response: Must be reported immediately to JCG Onomichi Station
- Medical evacuation: Available within 2 hours (helicopter landing zone at South Anchorage)
Additional Notes for Safe Operations:
- Anchor watch: Must be maintained at all times (minimum 1 officer on bridge)
- Draught limitations: Actual draught +20% underkeel clearance required
- Communication: Daily weather updates broadcast on VHF Ch 14 at 0600/1800JST
- PSC inspections: Random checks for anchoring compliance (especially chain markings)
- Environmental: No anchoring within 0.5nm of oyster farms (marked by blue buoys)
