{"version":"1.0.0","description":"Machine-readable history graph for agents. boatDaysLegacy = durable effect on Quality Boat Days.","eras":[{"id":"origins","title":"Origins","years":"Prehistory–500 CE","slug":"origins","stakes":"Boats invent coasts, trade, and the first freedom on water."},{"id":"age-of-sail","title":"Age of Sail","years":"500–1850","slug":"age-of-sail","stakes":"Wind becomes empire, commerce, and workboat craft."},{"id":"steam-to-gasoline","title":"Steam to Gasoline","years":"1850–1945","slug":"steam-to-gasoline","stakes":"Engines invent weekend recreation and fuel dependency."},{"id":"fiberglass-boom","title":"Fiberglass Boom","years":"1945–1995","slug":"fiberglass-boom","stakes":"Mass middle-class ownership via trailerables."},{"id":"modern-era","title":"Modern Era","years":"1995–present","slug":"modern-era","stakes":"Capability vs burden; QBD becomes the compass."}],"events":[{"id":"evt-dugout","year":-8000,"title":"Widespread dugout and raft use","eraId":"origins","impactTags":["mission-fit","materials"],"boatDaysLegacy":"Mission-fit craft from local materials remains the template for choosing the right boat."},{"id":"evt-nile","year":-3000,"title":"Nile organized water transport","eraId":"origins","impactTags":["logistics","state"],"boatDaysLegacy":"Seasonal readiness and infrastructure dependency foreshadow marinas and commission calendars."},{"id":"evt-polynesian","year":800,"title":"Polynesian ocean wayfinding mature","eraId":"origins","impactTags":["navigation","competence"],"boatDaysLegacy":"Judgment + environmental literacy still outperform gadgets alone on marginal days."},{"id":"evt-caravel","year":1450,"title":"Iberian caravel exploration surge","eraId":"age-of-sail","impactTags":["navigation","risk"],"boatDaysLegacy":"Redundant navigation and voyage planning as risk management."},{"id":"evt-chronometer","year":1760,"title":"Marine chronometer enables longitude","eraId":"age-of-sail","impactTags":["navigation","safety"],"boatDaysLegacy":"Precision instruments raise completion rates of planned passages."},{"id":"evt-workboats","year":1800,"title":"Regional workboat specialization peak","eraId":"age-of-sail","impactTags":["design","fishery"],"boatDaysLegacy":"Honest workboat DNA still predicts sea manners and usable days."},{"id":"evt-steam","year":1850,"title":"Commercial steam dominates rivers/coasts","eraId":"steam-to-gasoline","impactTags":["power","schedule"],"boatDaysLegacy":"Timetable thinking: owners expect departures on their schedule."},{"id":"evt-evinrude","year":1909,"title":"Practical gasoline outboard popularization","eraId":"steam-to-gasoline","impactTags":["outboard","recreation"],"boatDaysLegacy":"Personal ‘go when ready’ freedom — core of Go Today."},{"id":"evt-fiberglass","year":1950,"title":"Fiberglass recreational production scales","eraId":"fiberglass-boom","impactTags":["materials","mass-market"],"boatDaysLegacy":"Mass ownership + deferred maintenance opacity → need for surveys and passports."},{"id":"evt-trailer","year":1960,"title":"Trailerboat culture on US highways","eraId":"fiberglass-boom","impactTags":["access","suburban"],"boatDaysLegacy":"Access = tow + ramp + storage; access politics gate QBD inland."},{"id":"evt-gps","year":2000,"title":"Consumer GPS/chartplotters mainstream","eraId":"modern-era","impactTags":["electronics","safety"],"boatDaysLegacy":"Lower navigation anxiety; new complacency and power-budget failure modes."},{"id":"evt-4stroke","year":2006,"title":"Four-stroke/EFI outboard emissions era","eraId":"modern-era","impactTags":["emissions","reliability"],"boatDaysLegacy":"Reliability dividend increases spontaneous days; dealer/diagnostics dependency rises."},{"id":"evt-digital-brokerage","year":2012,"title":"Digital brokerage & peer forums dominant","eraId":"modern-era","impactTags":["market","information"],"boatDaysLegacy":"Price discovery improves; quality discovery still needs HIN graphs."},{"id":"evt-covid-demand","year":2020,"title":"COVID demand spike & marina scarcity","eraId":"modern-era","impactTags":["demand","access"],"boatDaysLegacy":"Waitlists and instructor shortages show access/skills as QBD bottlenecks."}],"entities":[{"id":"ent-hin","name":"Hull Identification Number","type":"identifier","notes":"Key for passport graphs"},{"id":"ent-uscg","name":"US Coast Guard","type":"regulator"},{"id":"ent-nmma","name":"NMMA","type":"industry"},{"id":"ent-outboard","name":"Outboard motor","type":"technology"},{"id":"ent-fiberglass","name":"Fiberglass composite hull","type":"technology"},{"id":"ent-chartplotter","name":"Multifunction display / chartplotter","type":"technology"},{"id":"ent-marina","name":"Marina / yacht club","type":"infrastructure"},{"id":"ent-survey","name":"Pre-purchase marine survey","type":"practice"}],"influences":[{"from":"evt-polynesian","to":"evt-gps","relation":"competence-vs-instruments","note":"Instruments amplify but do not replace environmental literacy"},{"from":"evt-workboats","to":"evt-fiberglass","relation":"design-dna","note":"Leisure forms inherit workboat hull families"},{"from":"evt-evinrude","to":"evt-4stroke","relation":"propulsion-lineage","note":"Personal power continuity"},{"from":"evt-fiberglass","to":"evt-digital-brokerage","relation":"opaque-used-market","note":"Mass production creates need for provenance"},{"from":"evt-trailer","to":"climate-waterways-access","relation":"access-dependency","note":"Ramp/storage politics remain central"},{"from":"evt-gps","to":"autonomy-and-assisted-skippering","relation":"sensor-foundation"},{"from":"evt-digital-brokerage","to":"connectivity-digital-twins-passports","relation":"provenance-demand"},{"from":"evt-4stroke","to":"electric-and-hybrid-propulsion","relation":"next-propulsion-s-curve"},{"from":"modern-era","to":"ai-crew-and-agents","relation":"burden-crisis-response"}],"provenance":{"source":"Boat Day","api_version":"1.8.0","as_of":"2026-10-12","method":"Curated editorial datasets in the Boat Day repo plus deterministic heuristics (valuation, TCO). No live market feed.","confidence":"Educational estimates. Records flagged demoData:true are illustrative. Not legal, tax, insurance, survey, or appraisal advice — verify with a licensed pro / official source.","honesty":"No paid placements. Outbound businesses labeled 'Find them online' are public-web listings, not partners. Founding partner roster is currently empty.","cite_as":"Boat Day (bestboatday.com) — free boating knowledge & tools for owners","terms":"https://bestboatday.com/for-agents#terms","docs":"https://bestboatday.com/llms.txt"}}