Seastead Design & Anguilla Maritime Regulations

🏠 The Seastead — Detailed Description

Main Living Structure

Above the water sits a large triangular truss frame. The left and right sides are each 70 feet long, and the back spans 35 feet wide. The apex opposite the 35 ft back side points forward. This triangle forms a fully enclosed living area with a floor-to-ceiling height of 7 feet, wrapped in extensive glass for panoramic ocean views.

Three Foil-Shaped Legs (Floats / Wings)

Buoyancy comes from three legs, each 19 feet long with a NACA 0030 foil profile — 10-foot chord and 3-foot maximum width. Each leg mounts underneath the main triangle near one of its three corners, with the top portion integrated inside the triangle's footprint. Approximately 50% of each leg sits below the waterline (≈9.5 ft submerged), creating a small-waterplane-area effect — akin to a miniaturized semi-submersible oil platform — that dramatically reduces wave-induced motion while maintaining low drag when underway.

All three legs are oriented parallel, with the blunt leading edge facing forward for streamlined hydrodynamics. The top half of each leg (above water) includes a built-in ladder on its forward face.

RIM Drive Thrusters

Six RIM drive thrusters (1.5 ft diameter each) are installed — one on each side of every leg — positioned approximately 3 feet up from the bottom of each foil. Their flat faces are oriented fore and aft for optimal thrust and minimal drag. This distributed propulsion arrangement provides exceptional maneuverability, including station-keeping and sideways translation.

Solar & Roof

The entire roof surface is covered with solar panels, supplying the electric propulsion and house loads.

Dinghy & Rear Deck

Behind the back face, near the centerline, two support arms extend outward with ropes descending to a 14-foot RIB tender equipped with a Yamaha HARMO electric outboard. The dinghy rests sideways against the center of the rear wall, shielded from wind while the seastead moves forward. Flanking the dinghy on both port and starboard sides, a 5-foot-wide deck extends beyond the back of the triangle, providing additional outdoor space.

Stabilizers (Servo-Tab "Little Airplanes")

Near the aft end of each main leg, a stabilizer resembling a small airplane is attached. Each has a 12-foot wingspan, 1.5-foot chord, a 6-foot-long body, and a tail elevator with 2-foot span and 6-inch chord. A compact actuator adjusts the elevator angle, which in turn alters the main wing's angle of attack — implementing the elegant servo-tab principle so that a small actuator can control substantial hydrodynamic forces. A shallow notch (~25% chord) in the wing's leading edge accommodates the thin trailing portion of the leg, keeping the center of lift balanced on the pivot axis.

Station-Keeping & Mooring

For extended stays in one location, three helical mooring screws can be deployed to create tension-leg mooring, holding the seastead nearly stationary — ideal for "parked" mode.

Community Connectivity

Two seasteads can link bow-to-stern via a walkway, enabling people to move freely between them while underway — a key feature for building a genuine floating community.

🛥️ What Is a "Personal Watercraft" (PWC) in Anguilla?

General Definition

In Anguilla — as in most Caribbean jurisdictions influenced by UK maritime law — a "personal watercraft" (PWC) is typically defined as:

A vessel under approximately 4 meters (≈13 feet) in length.
Propelled by a water-jet pump driven by an internal combustion engine or electric motor.
Designed to be operated by a person sitting, standing, or kneeling ON the vessel — not enclosed within a cabin or cockpit.
Often referred to colloquially as "jet skis," "wave runners," or "personal watercraft."
The operator typically wears a kill-switch lanyard and the craft has no traditional rudder — it steers by vectored jet thrust.

📋 Anguilla-Specific Note: Anguilla designates certain beach zones (such as parts of Sandy Ground on the western coast) as areas where personal watercraft may operate. These zones are managed by the Anguilla Port Authority and the Department of Maritime Affairs. Local by-laws may impose speed limits, operating hours, and distance-from-shore restrictions within these zones.

Could a Scaled-Down Single-Person Seastead Qualify?

This is a nuanced question. Here's the analysis:

If the scaled version is an open, unenclosed craft where the rider sits or stands exposed (similar to an electric foil board or jet ski) and uses a water-jet or RIM-drive propulsion system, it may plausibly fall within the PWC definition — especially if its length is under ~13 feet and the rider operates it from on top rather than inside.
If it has any form of enclosure, cabin, or seated cockpit (even minimal), Anguillian authorities are more likely to classify it as a "pleasure craft" or "small boat" rather than a PWC. The distinction matters because pleasure craft often require registration, safety equipment, and possibly a license.
If it uses foils (like the NACA-shaped legs) and rides partially lifted, it may also be viewed as an "experimental craft" or "hydrofoil vessel", which could trigger additional scrutiny from maritime safety officials.
Given your beach access in the Sandy Ground area, you are in one of the designated PWC zones — this is helpful. However, a novel design like a scaled seastead (even single-person) will almost certainly attract attention from the Port Authority. Proactive consultation is strongly recommended.

                💡 Practical Suggestion: Before building or deploying, prepare a one-page description with diagrams,
                dimensions, propulsion type, and intended operating area. Present this to the Anguilla Port Authority
                and ask for a written determination on classification. This can prevent misunderstandings and
                potential enforcement action.
            

🤖 USV / Ocean Drone Laws in Anguilla

Current Regulatory Landscape

Anguilla, as a British Overseas Territory, generally follows the framework of the UK Merchant Shipping Act with local adaptations. As of early 2025, Anguilla does not have standalone legislation specifically addressing Unmanned Surface Vessels (USVs) or ocean drones. However, this does not mean unregulated operation is permitted. Several overlapping frameworks apply:

Port Authority Regulations: The Anguilla Port Authority has jurisdiction over all vessels operating in Anguillian waters. Any USV may be considered a "vessel" and thus subject to general maritime safety and navigation rules.
COLREGs (International Regulations for Preventing Collisions at Sea): These apply to all vessels, including unmanned ones. A USV must be capable of complying with navigation light requirements, right-of-way rules, and collision avoidance — or it may be deemed unseaworthy.
Radio Communications: If the USV uses radio control or telemetry, Anguilla's telecommunications regulations (administered by the Ministry of Communications) may require frequency licensing, especially for high-power or long-range systems.
Environmental Protection: The Department of Environment may have concerns about USVs operating near reefs, seagrass beds, or marine protected areas.

⚠️ Important: Even if no specific USV law exists, operating an unmanned vessel without prior notification to the Port Authority and relevant agencies could be treated as a maritime safety violation or create liability exposure if an incident occurs.

What to Do Before Sending a USV Out in Anguilla

Notify the Anguilla Port Authority — Provide details: vessel dimensions, propulsion, control method, operating area (with GPS coordinates), duration, and contact information. Request their written acknowledgment or any conditions they wish to impose.
Check with the Department of Maritime Affairs — Confirm whether your USV requires registration, even if unmanned. Some jurisdictions require all vessels over a certain size to be registered regardless of crew status.
Assess COLREGs Compliance — Ensure your USV can display appropriate navigation lights (if operating between sunset and sunrise or in reduced visibility) and has a means of collision avoidance (e.g., AIS transponder, radar reflector, or remote visual monitoring).
Radio Frequency Clearance — If using RF control or telemetry beyond consumer-grade equipment, consult the Ministry of Infrastructure, Communications, and Utilities about any required spectrum licenses.
Environmental Consultation — Contact the Department of Environment, especially if operating near Sandy Ground's marine ecosystems, to ensure no sensitive habitats are affected.
Local Stakeholder Awareness — Inform nearby beachfront property owners, dive operators, and fishermen about your planned operations to avoid conflicts or false alarms.
Insurance — Obtain third-party liability insurance covering maritime operations. This is often required for any vessel and is prudent even if not strictly mandated for USVs.
Keep a Visual Observer — Even if the USV is autonomous, having a shore-based or boat-based visual observer maintaining line-of-sight can satisfy safety concerns and COLREGs obligations.

📋 Requirements, Paperwork & Licensing in Anguilla

Below is a summary of what is typically required for various vessel categories in Anguilla. Always verify with the Anguilla Port Authority and Department of Maritime Affairs, as regulations can change and may be applied on a case-by-case basis for novel designs.

#	Category	Typical Requirements	Notes for Your Project
0	Personal Watercraft (PWC / Jet Ski)	• Operator must typically be 16+ years old • Kill-switch lanyard required • Operation only in designated zones (e.g., Sandy Ground) • Speed limits & distance-from-shore rules apply • May require local PWC permit or registration sticker • Third-party liability insurance often required	If your scaled single-person version is classified as a PWC, it must comply with all PWC zone rules. The novel foil design may prompt additional safety review.
1	Pleasure Craft / Small Boat (Private recreational vessel)	• Registration with the Anguilla Port Authority / Maritime Affairs • Boat license or operator competency certificate may be required • Safety equipment: life jackets, flares, VHF radio, fire extinguisher, first-aid kit • Navigation lights for night operation • Annual or periodic safety inspection possible • Insurance strongly recommended (often required)	The full seastead (70 ft triangle) would almost certainly fall into this category — or possibly a higher classification given its size and novel design. Expect a thorough inspection.
2	Tender / Dinghy (≤14 ft, used as ship's boat)	• Often exempt from separate registration if used exclusively as a tender to a registered mother vessel • Must still carry basic safety gear (life jackets, oars/paddle, bailer) • If operated independently (beyond tender service), may need its own registration • Electric outboard (Yamaha HARMO) may simplify regulations vs. fuel-powered	Your 14-ft RIB with HARMO electric outboard is likely considered a tender. If it stays with the seastead, it may not need separate registration. Confirm with the Port Authority.
3	Experimental Craft (Novel / prototype vessels)	• No standard pathway — handled case-by-case • May require a special permit or exemption from the Port Authority • Often subject to restricted operating areas and sea trial conditions • May need a qualified skipper aboard during trials • Detailed risk assessment and safety plan often requested • Insurance may be difficult to obtain — specialized marine underwriter needed	This is the most relevant category for your seastead. Given its trimaran-foil configuration, small-waterplane-area design, and RIM drive propulsion, Anguillian authorities will likely treat it as experimental. Proactive engagement and documentation are essential.

                🔑 Key Takeaway: The seastead — whether full-scale or scaled — does not fit neatly into any
                existing regulatory box in Anguilla. Early, transparent communication with the Anguilla Port Authority
                    and Department of Maritime Affairs is the single most important step you can take. Bring diagrams,
                specifications, safety features, and a proposed operating plan. A cooperative approach is far more likely to
                yield a favorable outcome than attempting to operate without prior clearance.
            

📝 Summary & Recommended Next Steps

For the Full Seastead

Contact the Anguilla Port Authority — Request a preliminary meeting to discuss classification.
Prepare a comprehensive design dossier — Include engineering drawings, stability calculations, propulsion specifications, mooring plans, and safety systems.
Engage a marine surveyor — A recognized surveyor can provide an independent assessment that may smooth the regulatory path.
Secure insurance — Work with a broker specializing in experimental or novel marine craft.
Plan for phased sea trials — Propose a graduated testing program starting in sheltered waters.

For the Scaled Single-Person Version

Determine dimensions and features — If it's open, under ~13 feet, and jet/rim-driven, it may plausibly fit the PWC definition for Sandy Ground operations.
Present to the Port Authority — A one-page summary with photos/renderings can help them make a classification determination.
Comply with PWC zone rules — Even if classified as experimental, operating within designated PWC zones during initial tests may reduce regulatory friction.
Consider labeling it as an "electric personal watercraft prototype" — This framing aligns with existing categories and may simplify approvals.

📞 Key Contacts to Reach:
• Anguilla Port Authority — Primary maritime regulator
• Department of Maritime Affairs — Vessel registration & safety
• Royal Anguilla Police Force – Marine Unit — Enforcement & on-water safety
• Department of Environment — Environmental clearances
• Ministry of Infrastructure & Communications — Radio/spectrum licensing

Disclaimer: This document provides general informational guidance based on publicly available information about Anguilla's maritime regulatory framework. It does not constitute legal advice. Regulations may change, and determinations are made by Anguillian authorities on a case-by-case basis. Always consult directly with the relevant government bodies before undertaking any maritime activity.

Seastead Design Overview