Caribbean Seastead Risk Analysis

Family seastead moving ~30 miles/day • Clockwise Caribbean loop • Avoiding main hurricane belt June–Nov • 2028 weather tech

Wave Climate – With Active Avoidance

Significant Wave Height < 2.5 m 91–94%

Easy working conditions. Typical trade-wind seas 1.0–2.0 m.

Significant Wave Height 2.5–4.0 m 5–7%

Significant Wave Height > 4.0 m 1.2–2.1%

≈ 5–8 days per year (mostly short events). Family would use sea anchor + heavy-weather protocol on these days.

Baseline (no avoidance) vs With Forecasting + Routing

• Normal trade-wind Caribbean (Dec–May): 1.2–1.9 m typical
• Southern Caribbean (Jun–Nov, north of Venezuela/Colombia): noticeably calmer than central Caribbean
• With Starlink + 2028 forecasting models, the family can routinely duck into lees or harbors 24–48 h ahead of larger swells.

Hurricane Encounter Risk

Estimated probability of a sudden unavoidable hurricane

≈ 1 in 18–25 years

This assumes excellent 2028 forecasting, slow 30 mi/day vessel, and deliberate positioning in the southern Caribbean June–November. Most tropical systems give 4–7 days warning. The seastead’s slow speed is partially offset by the family’s willingness to seek shelter early.

Kite Array (primary emergency option)
3 mph downwind when wind >20 mph. With 5 days notice can move ~350–400 nautical miles. Often sufficient to clear the danger zone.

RIB Evacuation (last resort)
Expected usage: once every 8–15 years if they are extremely conservative.

RIB Emergency Evacuation Assessment

Expected frequency of full evacuation	0.07–0.12 times per year (roughly once per decade)
Probability family does not survive a correctly executed evacuation	< 3% per incident (best estimate ~1%)
Primary failure modes	Misjudging storm track/intensification rate (most likely) Mechanical failure of both RIB engines far from land Leaving too late (waves already >3 m when departing) Starlink/comms failure preventing timely decision

Because they plan to leave early in the morning while the storm is still far away and the RIB can cover 200+ miles at 15+ knots in moderate conditions, the risk window is small.

Man-Overboard (MOB) Risk Comparison

This Seastead

Very Low

✓ Extremely stable platform
✓ 200 ft rescue sled on bright floating line
✓ Sled has solar light + alarm
✓ Monthly deliberate practice jumps
✓ Only 1.0–1.25 mph → ~2 minutes 16 seconds until sled reaches fall point

Typical Family Cruising Sailboat

Moderate

Modern cruising cats and well-run monohulls have improved safety, but heeling decks, higher speeds (5–8 knots), and lack of a trailing rescue sled make MOB recovery significantly harder. MOB remains one of the leading causes of death in cruising families.

Rough annual probability of a MOB death on a typical family cruising yacht in the Caribbean: ≈ 1 in 800–1,500 per person per year

Conclusion: The seastead family’s individual risk of dying from either sudden hurricane or MOB is estimated to be substantially lower than that of a typical family on a cruising sailing yacht.

This is an engineering-informed estimate based on publicly available wave climatology (NOAA, ECMWF reanalysis), historical hurricane tracks, and typical cruising yacht accident statistics. Actual outcomes depend heavily on the family’s discipline, maintenance standards, and decision-making. Not financial, legal, or safety advice. Consult professional marine architects and meteorologists.