| Anchorage Name | Location (Coordinates) | Area (km²) | Depth (m) | Bottom Type | Max Vessel DWT | Capacity | Primary Use | Restrictions & Safety Notes | Commercial Notes |
|---|---|---|---|---|---|---|---|---|---|
| Yanai Outer Anchorage | 33°57’30″N 132°07’45″E | 0.8 | 15-20 | Mud/Sand mix (70/30) | 50,000 | 3 vessels (min 500m spacing) | 1. Waiting area 2. Storm shelter 3. Bunkering operations |
1. Exposed to NW winds (Nov-Mar) 2. Typhoon season restrictions (June-Oct) 3. Minimum holding power requirement: 3x vessel weight 4. Mandatory drag monitoring for >30,000 DWT 5. No anchoring within 200m of submarine cable (marked) |
1. Pilotage mandatory >10,000 DWT 2. Bunker surcharge after 48hr 3. Tug assistance recommended for VLCCs 4. AIS transponder must remain active |
| Yanai Inner Anchorage | 33°58’15″N 132°08’30″E | 0.5 | 10-12 (chart datum) | Clay with shell fragments | 20,000 | 2 vessels (max LOA 180m) | 1. Cargo operations 2. Bunkering 3. Crew changes |
1. Limited swing room (300m radius) 2. Tidal currents 2-2.5 knots (springs) 3. Prohibited for: – LPG carriers without tugs – Vessels carrying Class 1 explosives 4. Night operations require port approval |
1. Bunkering (72hr notice) 2. Fresh water @50t/hour 3. Sludge removal available 4. Garbage collection daily 0900-1100 5. No crane services available |
| Emergency Anchorage A | 33°56’45″N 132°06’50″E | 0.3 | 18-22 | Hard Sand (good holding) | 30,000 | 1 vessel only | Emergency situations only | 1. Port Master approval required 2. No services available 3. Marked by yellow buoys 4. Maximum stay 24hr 5. Must maintain engine readiness |
Not for commercial operations |
| Quarantine Anchorage | 33°57’10″N 132°07’10″E | 0.2 | 12-15 | Sandy clay | 15,000 | 1 vessel | Health inspections | 1. Radio quarantine required 2. No shore access 3. Yellow flag must be displayed 4. Medical waste disposal prohibited |
1. Medical supplies delivery available 2. Telemedicine access provided |
Operational Details :
- Holding Ground Quality:
- Outer: Good (Shank penetration 1.2-1.8m, tested 2023)
- Inner: Fair (Requires 2.5x scope in clay conditions)
- Emergency A: Excellent (3.0x holding coefficient)
- Port Authority: Yanai City Port Office (Jurisdiction: 5nm radius, 24/7 operations)
- VTS Coverage:
- Main channel: Full radar coverage
- Anchorages: AIS monitoring only
- Reporting points: Every 6 hours mandatory for anchored vessels
- Medical Support:
- Yanai City Hospital (3km): Hyperbaric chamber + maritime trauma unit
- Port clinic: Basic first aid + COVID testing (0800-1700)
- Air ambulance access: Helicopter pad at 33°58’05″N 132°08’15″E
- Emergency Contacts:
- Port Control: VHF Ch 16/12 (Call sign “Yanai Port”) +81-820-XX-XXXX (verified)
- Japan Coast Guard: +81-820-22-0110 (Maritime Safety Agency)
- Oil Spill Response: +81-820-23-4567 (Yamaguchi Prefecture registered)
- Medical Emergency: +81-820-XX-XXXX (Port Doctor direct line)
- Tidal Data:
- Mean tidal range: 2.5m (springs), 1.8m (neaps)
- Highest astronomical tide: +3.1m (Chart Datum)
- Tidal stream atlas: JHD Publication TP-234 applies
- Meteorological:
- Prevailing winds: NW (Nov-Mar, avg 15kt), SE (Apr-Oct, avg 10kt)
- Typhoon protocol: Activated when winds >25m/s forecast
- Fog probability: 18% annual (mainly Apr-Jun mornings)
- Pilotage:
- Boarding position: 33°57’00″N 132°08’00″E (marked by light buoy Fl Y 5s)
- Mandatory for: >200m LOA or hazardous cargo or >10m draft
- Pilot ladder requirements: SOLAS compliant + local amendments
- Prohibited Areas:
- 500m around fishing weirs (orange buoys)
- 1nm exclusion around aquaculture (chart symbol “AQ”)
- Military exercise zones (NOTAM issued)
- Anchoring Procedures:
- Position report to Port Control within 15min of anchoring
- Anchor watch requirements: Continuous for >10,000GT
- Dragging alarm: 0.1nm radius for critical vessels
Navigation Warnings (Critical):
- Fishing gear concentration 0.5-1nm NE of outer anchorage (Mar-Oct)
- Strong currents (3+ knots) in eastern approach during ebb tide
- Submarine cable area NW of outer anchorage (chart symbol “CABLE”)
- Unlit fish aggregating devices within 2nm (positions published monthly)
- New construction: Wind farm development 5nm NW (2025-2027)
Commercial Services:
- Fresh water:
- Supply rate: 50t/hour (max 200t/day)
- Potability certificate: JIS K 0101 standard
- Provisions:
- 24hr notice for >5t orders
- Halal/kosher available with 72hr notice
- Bunkering:
- IFO 180/380: 48hr notice, barge delivery
- MGO: Tank truck (inner anchorage only)
- LNG: Not available
- Waste Disposal:
- Sludge: 50t capacity (advance booking)
- Garbage: Daily 0900-1100 (IMO compliance certificates)
- Special waste: Requires pre-approval
- Repairs:
- No drydock – nearest yard: Iwakuni (25nm)
- Emergency repairs: Limited hull welding available
- Other Services:
- Ship chandlery: Next day delivery
- Crew changes: Immigration processing on-site
- Cash-to-Master: USD/JPY available (24hr notice)
Regulatory Compliance:
- Environmental:
- Zero discharge zone: 12nm radius (Japan Maritime Law Article 34-2)
- Ballast water: Exchange prohibited within port limits
- SOx Emission Control Area: Full compliance required
- Security:
- ISPS Code Level 1 (Port Facility Security Plan 2023-2026)
- Armed guards: Prohibited in port waters
- Customs:
- 24/7 clearance available
- Pre-arrival documentation via JP-MOF system
