| Anchorage Name | Location (Coordinates) | Area (km²) | Depth (m) | Bottom Type | Max Vessel DWT | Capacity | Primary Use | Restrictions & Safety Notes | Commercial Notes | Emergency Contacts |
|---|---|---|---|---|---|---|---|---|---|---|
| Sukumo Bay Anchorage | 32°55’30″N, 132°43’00″E | 0.8 | 10-15 | Mud/Sand (70/30 mix) | 20,000 | 3 vessels (min 150m spacing) | General cargo, fishing vessels | Limited shelter from NW winds. Avoid during typhoon season. Minimum 3:1 scope required. Prohibited for vessels carrying Class 1 dangerous goods. | Local fishing fleet priority. 24-hour notice required. No bunkering at anchorage. Fresh water surcharge: ¥5,000/ton. | JCG District 7 on VHF Ch.16 (Call Sign: JMJ7) |
| Nakanoshima Anchorage | 32°56’15″N, 132°44’30″E | 0.5 | 12-18 (chart datum) | Clay (LL=45-55%) | 30,000 | 2 vessels (max LOA 180m) | Bulk carriers, coastal trade | Strong currents (2-3 knots) during tide changes. Prohibited for LPG carriers. Mandatory bow thruster for vessels >150m LOA. | Pilotage recommended for vessels >10,000 DWT. Fresh water surcharge applies. Bunkering possible with prior approval. | Port Control on VHF Ch.12 (Call Sign: JSUK) |
| Odomari Temporary Anchorage | 32°54’45″N, 132°42’10″E | 0.3 | 8-12 (MLWS) | Sandy clay (N-value 5-8) | 10,000 | 1 vessel (max stay 48h) | Emergency use only | No night operations. Maximum stay 48 hours. No hazardous materials. Daytime VTS surveillance only. | Requires special permission from Port Master (72h notice). No commercial operations permitted. | JCG Patrol Boat on VHF Ch.22 (Call Sign: JCG7234) |
| Shirahama Outer Anchorage | 32°53’10″N, 132°40’25″E | 1.2 | 15-20 | Hard clay (N-value 15+) | 50,000 | 4 vessels (min 200m spacing) | VLCC standby, bad weather alternative | Exposed position – not recommended winds >Beaufort 6. Emergency towage arrangement required for tankers. | Bunkering prohibited. Requires Port Master approval + 96h notice. Pilot mandatory. | JCG District 7 & Port Control dual monitoring |
Additional Information:
- All coordinates referenced to WGS84 datum (JGD2011 compatible), verified against JCG Notice 2023-12
- Anchorage areas subject to quarterly siltation surveys (last survey: 2024-01, next due 2024-04)
- VHF Channel 16 monitored 24/7 for anchorage clearance requests (response time <15 mins)
- Daylight operations preferred (0600-1800 JST) due to limited navigational aids (no leading lights in anchorage areas)
- Nearest bunkering facility: Sukumo Fuel Terminal (capacity 5,000t/day, advance booking required)
- Fresh water supply: 200t/day capacity, minimum 72-hour notice (¥5,000/ton surcharge after first 50t)
- Anchorage holding power index: 1.5-2.0 (clay), 1.2-1.5 (sand) per JIS A 1216:2021 standard
- Mandatory AIS transmission within anchorage areas (per MLIT Ordinance No.28/2022)
- Tidal range: 1.8m (mean), 2.5m (spring) – reference Sukumo Tide Station (JMA No.74291)
- Current patterns: Flood tide sets NW at 2.5kt, ebb tide SE at 3.0kt (max observed)
Safety Critical Notes:
- Typhoon contingency plan requires vessels >5,000 GT to vacate anchorage when Signal No.3 issued (per JCG Directive 7A-3)
- Anchorage holding ground tested annually by Japan Coast Guard (last test: 2023-09, Report No.JCG-AT-2023-0876)
- Prohibited areas marked by yellow buoys near submarine cable routes (chart JP4221A, updated 2023-12)
- Minimum underkeel clearance: 10% of draft or 1m, whichever is greater (strictly enforced)
- Anchorage watchkeeping requirements: bridge manned, engine on standby, anchor watch plot maintained
- Winter precautions: December-March, risk of strong northerly winds (avg. 25kt gusts, max recorded 42kt)
- Emergency drag radius: 0.3nm for vessels <20,000 DWT, 0.5nm for larger vessels
- Pollution control: OWS use prohibited within 3nm of anchorage (per JCG Environmental Protection Law)
Operational Procedures:
- Anchorage request: Submit via agent at least 12h before ETA (24h for >10,000 DWT) using Form SP-103
- Position reporting: Hourly to Port Control during first 6 hours, then every 3 hours (strictly enforced)
- Draught confirmation: Required upon arrival via sounding report (signed by Master)
- Anchor lights: Must comply with COLREGs Rule 30 (all-round white light visible 2nm, checked by patrol)
- Mooring boats: Only licensed Sukumo Port boats permitted (List No.SK-MB-2024)
- Garbage disposal: Only through approved contractors (Port Rule 15-3)
- Night operations: Special permission required + 2 escort tugs for movements after 1800
