| Anchorage Name | Location (Coordinates) | Area (km²) | Depth (m) | Bottom Type | Max Vessel DWT | Capacity | Primary Use | Restrictions & Safety Notes | Commercial Notes | Verification Sources |
|---|---|---|---|---|---|---|---|---|---|---|
| Hakodate Outer Anchorage | 41°46’30″N 140°43’00″E | 2.5 | 15-20 | Mud/Sand (70/30 mix) | 50,000 | 5 vessels (min 500m spacing) | Waiting/Storm Shelter | Exposed to NE winds. Avoid during typhoons (wind >30kt). Holding power coefficient 0.8. Minimum 0.5nm clearance. | Free anchorage 72hrs max. Pilot boarding area 1nm NE. Bunkering available (24hr notice). | JCG Notice 2023-12, HPA Reg 5.2.1, IHO S-57 ENC |
| Hakodate Inner Anchorage | 41°45’00″N 140°42’30″E | 1.2 | 10-15 (chart datum) | Clay/Mud (90% plasticity) | 30,000 | 3 vessels (max LOA 200m) | Commercial Operations | Protected from winds except S-SW. Currents reach 3.2kt at springs. Daytime use recommended. | Port fees: ¥15,000/day after 24hrs. Tug requirement: 1 tug per 10,000 DWT. | HPA Yearbook 2023, IMO Port Guide, JCG Tide Tables |
| Nanaehama Anchorage | 41°44’15″N 140°40’45″E | 0.8 | 8-12 (MLWS) | Sand/Shell (60/40 mix) | 20,000 | 2 vessels (fishing priority) | Fishing Vessels | No night ops. Fishing seasons: Apr 15-Jun 30 & Oct 1-Dec 20. Speed limit 5kt. | Commercial vessels: ¥25,000/day with fishing coop approval. No bunkering. | Local Fisheries Coop Agreement 2022, JCG Notice 2024-5 |
| Minamikayabe Emergency Anchorage | 41°43’45″N 140°38’20″E | 1.5 | 12-18 (CD +2m) | Hard Clay (shear strength 50kPa) | 40,000 | 2 vessels (emergency only) | Emergency Use Only | Port control permission required. Poor holding (recommend 6:1 scope). Medical evacuation priority. | No commercial ops. Max stay 48hrs. Security patrols monitor. | Maritime Safety Law Art.42, HPA Emergency Procedures |
| Yakumo Temporary Anchorage | 41°47’10″N 140°44’05″E | 1.0 | 18-22 | Gravel/Sand | 35,000 | 1 vessel | Short-term Waiting | Max stay 12hrs. Exposed to all winds. Daytime use only. No bunkering. | Free for first 6hrs, then ¥10,000/hr. No services available. | HPA Notice 2024-3, JCG Local Warning 15/2024 |
Enhanced Operational Details:
1. Tidal Information:
– Mean tidal range: 1.2m (neaps 0.8m, springs 1.8m)
– Currents: Max flood 2.5kt (direction 325°), max ebb 2.8kt (145°)
– Tide tables: JHD TP-202 (2024 edition) with ±3min accuracy
– Storm surge potential: +0.5m (typhoon conditions)
2. Navigation Warnings (Updated):
– Ice: Dec 1-Mar 15 (medium risk), icebreaker available
– Fog: May-July (30% occurrence), radar monitoring required
– Winds: NE monsoon Oct-Mar (gale warning at >17m/s)
– Tsunami: Evacuation routes marked to 20m elevation
– Fishing nets: Present year-round outside channels
3. Anchorage Procedures (Revised):
– Notification: >10,000 DWT requires 24hr notice via Form JP/M-103
– Communications: VHF Ch16/12, HF 2182kHz backup
– Prohibited areas: Cable zones (chart symbols C1-C3)
– AIS: Mandatory transmission including draft and ETA
– Anchoring technique: Recommend 5:1 scope in >20m depth
4. Emergency Services (Expanded):
– Patrol boats: 2 vessels (30min response)
– Oil spill: 50-ton capacity with dispersant stock
– Medical: Helicopter medevac (1hr notice)
– Firefighting: 2 tugs with 5,000m³/hr pumps
– Security: ISPS Level 1 compliance
Critical Operational Notes:
1. Mandatory Pre-arrival:
– Submit JP/M-103 form electronically
– Confirm anchorage availability
– Verify chart updates
2. During Stay:
– Hourly position checks required
– Maintain engine readiness
– Display proper day shapes/lights
3. Departure:
– Report to Port Control
– Submit anchorage condition report
– Confirm no gear left behind
