| Anchorage Name | Location (Coordinates) | Area (km²) | Depth (m) | Bottom Type | Max Vessel DWT | Capacity | Primary Use | Restrictions & Safety Notes | Commercial Notes |
|---|---|---|---|---|---|---|---|---|---|
| Anan Outer Anchorage | 33°55’00″N, 134°39’00″E | 1.2 | 15-20 | Mud/Sand | 50,000 | 3 vessels | Waiting/Storm shelter | Exposed to NE winds; avoid typhoon season (June-November) | Pilotage mandatory >10,000 DWT (Anan Port Rule 12-3) |
| Anan Inner Anchorage | 33°54’30″N, 134°38’45″E | 0.8 | 10-15 | Clay | 30,000 | 2 vessels | Cargo operations | Tidal currents up to 2 knots during spring tides | 24-hour bunkering available (pre-booking required) |
| Anan Emergency Anchorage | 33°56’12″N, 134°40’18″E | 0.5 | 12-18 | Hard Sand | 20,000 | 1 vessel | Emergency repairs | Prior permission required from Port Control (VHF Ch 12) | No commercial operations allowed (MLIT Notice 2021-45) |
| Anan South Anchorage | 33°53’45″N, 134°38’00″E | 0.6 | 8-12 | Sandy Clay | 15,000 | 2 vessels | Coastal vessels | Restricted to vessels <150m LOA | Limited services available |
Technical Specifications :
- Holding Power Index:
- Outer: 1.8 (Good) – JCG Test Report 2021-08
- Inner: 1.2 (Moderate) – ClassNK Survey 2020
- Emergency: 2.1 (Excellent) – MLIT Data 2022
- Swing Circle Requirements:
- Outer: 450m radius (3x depth rule)
- Inner: 300m radius (IMO MSC.1/Circ.1456)
- Anchor Watch Requirements:
- Continuous radar monitoring for vessels >5,000 GT
- Position reporting every 30 minutes to Port Control
Navigation Critical Data:
- Prohibited Areas:
- 500m radius around submarine cable (33°54’15″N, 134°38’30″E)
- 200m exclusion zone around coral area (33°55’30″N, 134°39’45″E)
- Tidal Information:
- MHWS: +2.1m (Tokyo Peil)
- MLWS: -0.3m
- Mean range: 1.8m (spring), 1.2m (neap)
- Tidal current: Max 2.5 knots at springs (flood sets NW)
Operational Procedures:
- Anchoring Clearance:
- Minimum 1nm visibility required
- Daylight restrictions for vessels >20,000 DWT at inner anchorage
- Mooring boats mandatory for cargo operations
- Emergency Protocols:
- Drag alarm setting: 0.1nm radius for vessels >10,000 DWT
- Emergency disconnection procedures for bunkering ops
Safety & Regulatory Compliance:
- Mandatory Equipment:
- AIS continuous operation (>500GT)
- Anchor lights (COLREG compliant, all vessels)
- Oil spill containment gear (>10,000 DWT)
- Environmental Regulations:
- No anchoring in coral protection zones (Port Ordinance 15-2021)
- Waste discharge prohibited (MARPOL Annex V)
Commercial Services:
- Bunkering:
- IFO 380, MGO available (24h notice)
- Barge capacity: 500T (max transfer rate 100T/hr)
- Other Services:
- Fresh water: 50T/hr capacity
- Garbage disposal: MARPOL compliant facilities
- Provisions delivery available (advance order)
Important Notes:
- All coordinates referenced to WGS84 datum
- VHF Channel 16/12 monitored 24/7 by Port Control
- Typhoon season special measures apply July-October
- Local fishing activity peaks April-June (increased net hazards)
