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Tension-Leg Platform Configuration | Sandy Bottom Mooring | <100ft Depth
| Location | Coordinates | Dist from Anguilla | Depth | Bottom Type | Visibility | Wave Exposure |
|---|---|---|---|---|---|---|
| Prickly Pear Bay (Lee) | 18.360°N, 63.080°W | 5.8 nm NNE | 25-85 ft | White sand patches | Below horizon from coastal flats | Protected (E-SE trades) |
| Dog Island Southeast | 18.275°N, 62.995°W | 4.2 nm NW | 30-90 ft | Sand/coral rubble | Hidden by Dog Island | Sheltered by island |
| Scrub Island West | 18.318°N, 62.945°W | 6.1 nm NE | 40-95 ft | Coarse sand | Over horizon from West End | Partial protection |
| Sombrero Bank (SE Leeward) | 18.550°N, 63.380°W | 28 nm NW | 35-80 ft | Calcareous sand | Completely over horizon | Exposed Atlantic |
| Sandy Island West | 18.350°N, 63.180°W | 8.5 nm W | 20-60 ft | Fine sand | Below horizon from east coast | Moderate exposure |
Lat/Lon: 18.360°N, 63.080°W Direction: NNE Distance from Main Island: 5.8 nm
Geography: Located in the lee (west side) of Prickly Pear Cays, approximately 6 nautical miles from Sandy Ground. The cays provide complete visual obstruction from Anguilla's north shore and partial obstruction from the east.
Capacity: The sandy basin covers approximately 0.8 square nautical miles of suitable bottom.
• 500-ft Grid Capacity: ~120 seasteads (accounting for mooring swing circles and access lanes)
• Optimal arrangement: Hexagonal packing with 600ft centers (allowing 100ft mooring radius)
Wave Climate:
• Normal Conditions: 1-2 ft (trade wind chop blocked by cays)
• Winter Swell: 3-5 ft (North Atlantic groundswell wraps slightly)
• Hurricane: 15-25 ft (direct exposure to northern quadrant)
Installation Notes: Sandy bottom excellent for screw moorings. Avoid coral heads (visible on charts) which punctuate the sand flat. Depth increases gradually to 85ft at eastern edge.
Lat/Lon: 18.275°N, 62.995°W Direction: NW Distance: 4.2 nm from West End
Geography: Sheltered position southeast of Dog Island, completely hidden from the main island by the island's mass. Dog Island (207 hectares) provides substantial wind and wave shadow.
Capacity: Sand shelf extends ~0.4 sq nm.
• 500-ft Grid Capacity: ~60 seasteads
• Constraint: Limited by depth contour dropping to 100ft at ~600m from island
Wave Climate:
• Prevailing Trades: 1-3 ft (blocked by Dog Island)
• SW Swell: 4-6 ft (unprotected from southwest)
• Hurricane: 12-20 ft (variable depending on track)
Lat/Lon: 18.550°N, 63.380°W Direction: NW Distance: 28 nm from Anguilla Nearest Land: 1.8 nm from Sombrero Island
Geography: Extensive shallow bank surrounding Sombrero Island (a nature reserve). Completely over the horizon from Anguilla (visual range ~12nm at 100ft elevation). Warning: Sombrero is a protected wildlife sanctuary; consult Anguilla National Trust before installation.
Capacity: Extensive sand flats covering 2.5+ sq nm.
• 500-ft Grid Capacity: 350+ seasteads
• Advantage: Multiple depth options (30-80ft)
Wave Climate:
• Standard Conditions: 4-7 ft (open Atlantic fetch)
• Winter Storms: 8-12 ft frequent
• Hurricane: 20-40 ft (extreme exposure)
Note: Tension-leg platforms recommended here due to significant wave energy.
Your request for locations ">200nm from any country, <100ft deep, within 2000 miles of Anguilla" describes a geophysical impossibility:
| Season | Typical Significant Wave Height | Period | Direction | Impact on Tension-Leg Design |
|---|---|---|---|---|
| Winter (Dec-Mar) | 2-4m (6-12ft) | 10-14 sec | N-NE | High loads on northern moorings |
| Trade Winds (Year-round) | 1-2.5m (3-8ft) | 6-8 sec | E-SE | Constant fatigue loading |
| Hurricane (Jun-Nov) | 5-15m (15-50ft) | 12-20 sec | Variable | Ultimate load design case |
Mooring Screw Suitability: