| Anchorage Name | Location (WGS84 Coordinates) | Area (km²) | Depth (m) | Bottom Type | Max Vessel DWT | Capacity | Primary Use | Restrictions & Safety Notes | Commercial Notes | Other Relevant Information |
|---|---|---|---|---|---|---|---|---|---|---|
| Moji Outer Anchorage A | 33°56’30″N, 130°54’00″E | 2.5 | 18-22 (LAT +3.5m tide) |
Mud/sand (70/30 mix) Holding power: 3.5t/m² |
150,000 | 6 vessels (min 500m spacing) |
VLCC/LNG carrier standby | Pilot mandatory; Typhoon restricted zone; Holding power 3:1 in normal conditions; Prohibited during tsunami warning | Bunkering available (12h notice); Max stay 72h; Fresh water @ 50t/hr | VTS Sector 1 monitoring; Emergency towage (2h standby); Underwater clearance 30m; Radar beacon at 33°56’35″N 130°54’05″E |
| Moji Outer Anchorage B | 33°55’45″N, 130°55’15″E | 1.8 | 15-18 (dredged -18m) |
Clay/mud (shear strength 50kPa) Holding coefficient: 0.85 |
80,000 | 8 vessels (min 300m spacing) |
General cargo vessels | Daylight ops preferred; Max LOA 250m; No anchoring in NE monsoon >25kt; Prohibited for vessels carrying Class 1 DG | Fresh water supply (100t/hr); Provisions available (24h notice); Ship chandler services | Dredged to -18m in 2022; Annual seabed survey; Current meters installed at 33°55’50″N 130°55’20″E |
| Moji Inner Anchorage | 33°56’00″N, 130°57’30″E | 0.8 | 10-12 (+1.5m tide) |
Sand/shell (holding coefficient 0.8) Penetration: 1.2-1.8m |
30,000 | 4 vessels (min 200m spacing) |
Coastal/feeder vessels | No hazardous cargo; Current 2-3 knots (max 4kt springs); Min 4:1 scope required; Fishing nets nearby | Quick turnaround (<24h); No bunkering; Limited provisions | Protected from NE winds; Night lighting (2x 1000W floodlights); VHF Ch 14 monitoring; Tug standby 1hr |
| Moji Emergency Anchorage | 33°57’00″N, 130°53’00″E | 1.2 | 20-25 (hard stratum at -22m) |
Hard clay (shear strength 120kPa) Holding power: 8t/m² |
200,000 | 2 vessels (min 800m spacing) |
Distress situations only | Prior permission required; Medical evacuation capability; Emergency towage priority; No commercial operations | No commercial operations; No stores/services available | Helipad (20m dia); Dedicated VTS Sector 3; Backup power; Emergency fuel transfer possible |
| Moji Bunker Anchorage | 33°55’15″N, 130°56’00″E | 0.5 | 14-16 (+2.0m tide) |
Mud (organic content <20%) Holding coefficient: 0.75 |
50,000 | 3 vessels (min 400m spacing) |
Fuel oil transfer | ISGOTT compliance required; No smoking zone; Static electricity precautions; Dedicated spill response team | 24h bunkering (3 approved suppliers); Max transfer rate 500m³/h; Gas-freeing permitted | Oil spill equipment on standby; Permanent boom deployment; VOC monitoring |
| Moji Quarantine Anchorage | 33°56’15″N, 130°55’30″E | 0.3 | 12-14 (+1.8m tide) |
Sandy (90% sand, 10% silt) Holding coefficient: 0.9 |
40,000 | 2 vessels (min 300m spacing) |
Health inspections | Radio silence except emergencies; Yellow flag display; No crew changes; Medical waste incineration | Medical waste disposal (1t/day capacity); Telemedicine available | Port Health Office monitoring (24h); Decontamination area; Isolation ward access |
| Moji Waiting Anchorage | 33°54’30″N, 130°56’45″E | 1.0 | 12-15 (+2.2m tide) |
Sandy clay Holding coefficient: 0.82 |
60,000 | 5 vessels (min 350m spacing) |
Pre-berthing holding | Max stay 48h; No cargo operations; Daytime anchoring preferred | Provisions delivery available; Waste collection service | Tug standby 4h notice; VHF Ch 11 monitoring; Temporary repairs permitted |
| Moji LNG Holding Anchorage | 33°57’15″N, 130°52’30″E | 1.5 | 22-25 | Firm clay Holding power: 10t/m² |
250,000 | 2 vessels | LNG carriers | Exclusion zone 500m; No other vessels permitted; Emergency shutdown system | LNG transfer prohibited; Emergency bunkering only | Thermal imaging monitoring; Dedicated safety boat |
Anchorage Technical Specifications:
- All depths referenced to Chart Datum (LAT) per IHO S-44 Ed6.1.1
- Holding ground tested annually per ASTM D2487-17 classification
- Anchor drag monitoring: DGPS (±10cm) + AIS + VTS radar overlay
- Swing circles: 5:1 scope normal conditions, 7:1 in typhoon alert (10:1 for LNG)
- Anchor weight requirements: Minimum 3.5t per 10,000 DWT (5t for LNG)
- Mooring line requirements: Minimum breaking load 1.5x vessel DWT
Environmental Conditions:
- Current: Max 3.5kts spring tide (045°-225°), 1.8kts neap; Eddy currents near Outer A
- Wave height: Significant <1.5m (90% time), typhoon season up to 4m (max recorded 6.2m)
- Visibility: <1km occurs 5-10 days/year (winter radiation fog); Annual avg 10km
- Sea temperature: 8°C (Feb) to 28°C (Aug); Thermocline at 15m depth in summer
- Salinity: 30-34 PSU (monitored quarterly); Lower surface salinity after rain
- Tidal range: 3.5m springs, 1.8m neaps; Storm surge potential +1.2m
Operational Procedures:
- Anchoring permission: VHF Ch 16/12 (Moji Port Control), email notice >2h prior with ETA
- Position reporting: Daily 0800/2000 JST + after any movement >100m; AIS mandatory
- Anchor watch: Mandatory when winds >15m/s or waves >2m; Log entries hourly
- Emergency contact: JMCC +81-93-321-2345 (24h English/Japanese); Backup VHF Ch 67
- Dragging anchor: Immediate report if movement >200m; Contingency plan required
- Typhoon procedure: Special mooring arrangement required >24h notice
Safety Critical Notes:
- NE monsoon winds (Dec-Feb): May require 7:1 scope + second anchor (45° angle)
- Submarine infrastructure: 0.5nm NW Outer Anchorage A (buoys JP-1123A-C); 1.2nm SE LNG zone
- UXO clearance: 3nm radius certification (2020); Unexploded ordnance hotline +81-93-327-1111
- Salvage capability: Nippon Salvage (1hr response) + 2 port tugs (120t bollard pull)
- Emergency medical: Moji Medical Center (3km) with decompression chamber + helipad
- Pollution response: Tier 2 (500t) + 2 oil skimmers (200m³/h capacity each)
- Navigation warnings: Strong currents near Outer B; Radar interference from Mt. Sarakura
